66686926320 has 480 divisors, whose sum is σ = 274439131200. Its totient is φ = 14829889536.

The previous prime is 66686926303. The next prime is 66686926367. The reversal of 66686926320 is 2362968666.

It is a super-2 number, since 2×66686926320² (a number of 22 digits) contains 22 as substring.

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 polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3907566 + ... + 3924594.

It is an arithmetic number, because the mean of its divisors is an integer number (571748190).

Almost surely, 2^66686926320 is an apocalyptic number.

66686926320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66686926320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137219565600).

66686926320 is an abundant number, since it is smaller than the sum of its proper divisors (207752204880).

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

66686926320 is a wasteful number, since it uses less digits than its factorization.

66686926320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17102 (or 17083 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 54.

The spelling of 66686926320 in words is "sixty-six billion, six hundred eighty-six million, nine hundred twenty-six thousand, three hundred twenty".