31561166432255 has 4 divisors (see below), whose sum is σ = 37873399718712. Its totient is φ = 25248933145800.

The previous prime is 31561166432221. The next prime is 31561166432261. The reversal of 31561166432255 is 55223466116513.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31561166432255 - 2¹⁰ = 31561166431231 is a prime.

It is a super-2 number, since 2×31561166432255² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3156116643221 + ... + 3156116643230.

It is an arithmetic number, because the mean of its divisors is an integer number (9468349929678).

Almost surely, 2^{31561166432255} is an apocalyptic number.

31561166432255 is a deficient number, since it is larger than the sum of its proper divisors (6312233286457).

31561166432255 is an equidigital number, since it uses as much as digits as its factorization.

31561166432255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6312233286456.

The product of its digits is 3888000, while the sum is 50.

The spelling of 31561166432255 in words is "thirty-one trillion, five hundred sixty-one billion, one hundred sixty-six million, four hundred thirty-two thousand, two hundred fifty-five".