39557997056 has 40 divisors (see below), whose sum is σ = 81764236620. Its totient is φ = 19096956928.

The previous prime is 39557997047. The next prime is 39557997071. The reversal of 39557997056 is 65079975593.

It can be written as a sum of positive squares in 2 ways, for example, as 38723942656 + 834054400 = 196784^2 + 28880^2 .

It is a junction number, because it is equal to n+sod(n) for n = 39557996983 and 39557997001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317251 + ... + 1346946.

Almost surely, 2^39557997056 is an apocalyptic number.

It is an amenable number.

39557997056 is an abundant number, since it is smaller than the sum of its proper divisors (42206239564).

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

39557997056 is an equidigital number, since it uses as much as digits as its factorization.

39557997056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664244 (or 2664228 counting only the distinct ones).

The product of its (nonzero) digits is 80372250, while the sum is 65.

The spelling of 39557997056 in words is "thirty-nine billion, five hundred fifty-seven million, nine hundred ninety-seven thousand, fifty-six".