37990665691 has 16 divisors (see below), whose sum is σ = 41566277088. Its totient is φ = 34435526400.

The previous prime is 37990665683. The next prime is 37990665793. The reversal of 37990665691 is 19656609973.

It is not a de Polignac number, because 37990665691 - 2³ = 37990665683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37990665631) 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, 6252631 + ... + 6258703.

It is an arithmetic number, because the mean of its divisors is an integer number (2597892318).

Almost surely, 2^37990665691 is an apocalyptic number.

37990665691 is a deficient number, since it is larger than the sum of its proper divisors (3575611397).

37990665691 is a wasteful number, since it uses less digits than its factorization.

37990665691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7662.

The product of its (nonzero) digits is 16533720, while the sum is 61.

The spelling of 37990665691 in words is "thirty-seven billion, nine hundred ninety million, six hundred sixty-five thousand, six hundred ninety-one".