31661522655 has 64 divisors (see below), whose sum is σ = 58921371648. Its totient is φ = 14217960960.

The previous prime is 31661522639. The next prime is 31661522681. The reversal of 31661522655 is 55622516613.

It is not a de Polignac number, because 31661522655 - 2⁴ = 31661522639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5678449 + ... + 5684021.

It is an arithmetic number, because the mean of its divisors is an integer number (920646432).

Almost surely, 2^31661522655 is an apocalyptic number.

31661522655 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31661522655 is a deficient number, since it is larger than the sum of its proper divisors (27259848993).

31661522655 is a wasteful number, since it uses less digits than its factorization.

31661522655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6536.

The product of its digits is 324000, while the sum is 42.

The spelling of 31661522655 in words is "thirty-one billion, six hundred sixty-one million, five hundred twenty-two thousand, six hundred fifty-five".