31655681651 has 16 divisors (see below), whose sum is σ = 35654888448. Its totient is φ = 27843765600.

The previous prime is 31655681647. The next prime is 31655681683. The reversal of 31655681651 is 15618655613.

It is a cyclic number.

It is not a de Polignac number, because 31655681651 - 2² = 31655681647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31655681596 and 31655681605.

It is not an unprimeable number, because it can be changed into a prime (31655686651) 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, 2977421 + ... + 2988033.

It is an arithmetic number, because the mean of its divisors is an integer number (2228430528).

Almost surely, 2^31655681651 is an apocalyptic number.

31655681651 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31655681651 is a deficient number, since it is larger than the sum of its proper divisors (3999206797).

31655681651 is a wasteful number, since it uses less digits than its factorization.

31655681651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19402.

The product of its digits is 648000, while the sum is 47.

The spelling of 31655681651 in words is "thirty-one billion, six hundred fifty-five million, six hundred eighty-one thousand, six hundred fifty-one".