31666600620721 has 16 divisors (see below), whose sum is σ = 35133434683200. Its totient is φ = 28297845736000.

The previous prime is 31666600620713. The next prime is 31666600620791. The reversal of 31666600620721 is 12702600666613.

It is not a de Polignac number, because 31666600620721 - 2³ = 31666600620713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31666600620791) 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, 7266735 + ... + 10776763.

It is an arithmetic number, because the mean of its divisors is an integer number (2195839667700).

Almost surely, 2^{31666600620721} is an apocalyptic number.

It is an amenable number.

31666600620721 is a deficient number, since it is larger than the sum of its proper divisors (3466834062479).

31666600620721 is a wasteful number, since it uses less digits than its factorization.

31666600620721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524000.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 31666600620721 in words is "thirty-one trillion, six hundred sixty-six billion, six hundred million, six hundred twenty thousand, seven hundred twenty-one".