31668402628261 has 48 divisors (see below), whose sum is σ = 38207481945600. Its totient is φ = 26155083088512.

The previous prime is 31668402628229. The next prime is 31668402628279. The reversal of 31668402628261 is 16282620486613.

It is not a de Polignac number, because 31668402628261 - 2⁵ = 31668402628229 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 (31668402628201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52291756 + ... + 52893898.

It is an arithmetic number, because the mean of its divisors is an integer number (795989207200).

Almost surely, 2^{31668402628261} is an apocalyptic number.

31668402628261 is the 3249021-st hex number.

It is an amenable number.

31668402628261 is a deficient number, since it is larger than the sum of its proper divisors (6539079317339).

31668402628261 is a wasteful number, since it uses less digits than its factorization.

31668402628261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602538 (or 602531 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 55.

The spelling of 31668402628261 in words is "thirty-one trillion, six hundred sixty-eight billion, four hundred two million, six hundred twenty-eight thousand, two hundred sixty-one".