66626196 has 192 divisors, whose sum is σ = 210212352. Its totient is φ = 15925248.

The previous prime is 66626191. The next prime is 66626227. The reversal of 66626196 is 69162666.

66626196 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

66626196 is a nontrivial binomial coefficient, being equal to C(11544, 2).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66626191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 686820 + ... + 686916.

It is an arithmetic number, because the mean of its divisors is an integer number (1094856).

Almost surely, 2^66626196 is an apocalyptic number.

66626196 is the 11543-rd triangular number and also the 5772-nd hexagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66626196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105106176).

66626196 is an abundant number, since it is smaller than the sum of its proper divisors (143586156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66626196 is a wasteful number, since it uses less digits than its factorization.

66626196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 176 counting only the distinct ones).

The product of its digits is 139968, while the sum is 42.

The square root of 66626196 is about 8162.4871209699. The cubic root of 66626196 is about 405.3980661730.

It can be divided in two parts, 666 and 26196, that added together give a palindrome (26862).

The spelling of 66626196 in words is "sixty-six million, six hundred twenty-six thousand, one hundred ninety-six".