39557393664 has 72 divisors (see below), whose sum is σ = 105444400320. Its totient is φ = 13165252608.

The previous prime is 39557393657. The next prime is 39557393669. The reversal of 39557393664 is 46639375593.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 39557393598 and 39557393607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39557393669) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 457092 + ... + 536700.

It is an arithmetic number, because the mean of its divisors is an integer number (1464505560).

Almost surely, 2^39557393664 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 39557393664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52722200160).

39557393664 is an abundant number, since it is smaller than the sum of its proper divisors (65887006656).

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

39557393664 is an equidigital number, since it uses as much as digits as its factorization.

39557393664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80275 (or 80261 counting only the distinct ones).

The product of its digits is 55112400, while the sum is 60.

The spelling of 39557393664 in words is "thirty-nine billion, five hundred fifty-seven million, three hundred ninety-three thousand, six hundred sixty-four".