31645840957669 has 16 divisors (see below), whose sum is σ = 32406627472128. Its totient is φ = 30895213093632.

The previous prime is 31645840957637. The next prime is 31645840957691. The reversal of 31645840957669 is 96675904854613.

It is a cyclic number.

It is not a de Polignac number, because 31645840957669 - 2⁵ = 31645840957637 is a prime.

It is a super-2 number, since 2×31645840957669² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31645840957369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1089117 + ... + 8029810.

It is an arithmetic number, because the mean of its divisors is an integer number (2025414217008).

Almost surely, 2^{31645840957669} is an apocalyptic number.

It is an amenable number.

31645840957669 is a deficient number, since it is larger than the sum of its proper divisors (760786514459).

31645840957669 is a wasteful number, since it uses less digits than its factorization.

31645840957669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119484.

The product of its (nonzero) digits is 1175731200, while the sum is 73.

The spelling of 31645840957669 in words is "thirty-one trillion, six hundred forty-five billion, eight hundred forty million, nine hundred fifty-seven thousand, six hundred sixty-nine".