31177406655 has 24 divisors (see below), whose sum is σ = 56042352912. Its totient is φ = 16627949568.

The previous prime is 31177406653. The next prime is 31177406669. The reversal of 31177406655 is 55660477113.

It is not a de Polignac number, because 31177406655 - 2¹ = 31177406653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 31177406655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31177406653) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 12828994 + ... + 12831423.

It is an arithmetic number, because the mean of its divisors is an integer number (2335098038).

Almost surely, 2^31177406655 is an apocalyptic number.

31177406655 is a deficient number, since it is larger than the sum of its proper divisors (24864946257).

31177406655 is an equidigital number, since it uses as much as digits as its factorization.

31177406655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25660437 (or 25660425 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The spelling of 31177406655 in words is "thirty-one billion, one hundred seventy-seven million, four hundred six thousand, six hundred fifty-five".