31066640646 has 16 divisors (see below), whose sum is σ = 62233665600. Its totient is φ = 10338816168.

The previous prime is 31066640623. The next prime is 31066640677. The reversal of 31066640646 is 64604666013.

It is a super-2 number, since 2×31066640646² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31066640598 and 31066640607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4178656 + ... + 4186083.

It is an arithmetic number, because the mean of its divisors is an integer number (3889604100).

Almost surely, 2^31066640646 is an apocalyptic number.

31066640646 is an abundant number, since it is smaller than the sum of its proper divisors (31167024954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31066640646 is a wasteful number, since it uses less digits than its factorization.

31066640646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8365363.

The product of its (nonzero) digits is 373248, while the sum is 42.

The spelling of 31066640646 in words is "thirty-one billion, sixty-six million, six hundred forty thousand, six hundred forty-six".