39561807957 has 16 divisors (see below), whose sum is σ = 60289306752. Its totient is φ = 22605004800.

The previous prime is 39561807949. The next prime is 39561807959. The reversal of 39561807957 is 75970816593.

It is not a de Polignac number, because 39561807957 - 2³ = 39561807949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39561807957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39561807959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237013 + ... + 367829.

It is an arithmetic number, because the mean of its divisors is an integer number (3768081672).

Almost surely, 2^39561807957 is an apocalyptic number.

It is an amenable number.

39561807957 is a deficient number, since it is larger than the sum of its proper divisors (20727498795).

39561807957 is a wasteful number, since it uses less digits than its factorization.

39561807957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145228.

The product of its (nonzero) digits is 14288400, while the sum is 60.

The spelling of 39561807957 in words is "thirty-nine billion, five hundred sixty-one million, eight hundred seven thousand, nine hundred fifty-seven".