37656531997 has 12 divisors (see below), whose sum is σ = 44458340160. Its totient is φ = 31795277976.

The previous prime is 37656531977. The next prime is 37656532013. The reversal of 37656531997 is 79913565673.

It is a de Polignac number, because none of the positive numbers 2^k-37656531997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37656531977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5731797 + ... + 5738362.

It is an arithmetic number, because the mean of its divisors is an integer number (3704861680).

Almost surely, 2^37656531997 is an apocalyptic number.

37656531997 is the 112037-th hex number.

It is an amenable number.

37656531997 is a deficient number, since it is larger than the sum of its proper divisors (6801808163).

37656531997 is a wasteful number, since it uses less digits than its factorization.

37656531997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11470240 (or 11470233 counting only the distinct ones).

The product of its digits is 32148900, while the sum is 61.

The spelling of 37656531997 in words is "thirty-seven billion, six hundred fifty-six million, five hundred thirty-one thousand, nine hundred ninety-seven".