66955896 has 160 divisors (see below), whose sum is σ = 222156000. Its totient is φ = 18434304.

The previous prime is 66955879. The next prime is 66955909. The reversal of 66955896 is 69855966.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 131290 + ... + 131798.

It is an arithmetic number, because the mean of its divisors is an integer number (1388475).

Almost surely, 2^66955896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66955896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111078000).

66955896 is an abundant number, since it is smaller than the sum of its proper divisors (155200104).

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

66955896 is a wasteful number, since it uses less digits than its factorization.

66955896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 550 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The square root of 66955896 is about 8182.6582477823. The cubic root of 66955896 is about 406.0656708221.

It can be divided in two parts, 669 and 55896, that added together give a palindrome (56565).

The spelling of 66955896 in words is "sixty-six million, nine hundred fifty-five thousand, eight hundred ninety-six".