877661435631 has 4 divisors (see below), whose sum is σ = 1170215247512. Its totient is φ = 585107623752.

The previous prime is 877661435611. The next prime is 877661435659. The reversal of 877661435631 is 136534166778.

It is a happy number.

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

It is not a de Polignac number, because 877661435631 - 2¹⁴ = 877661419247 is a prime.

It is a super-2 number, since 2×877661435631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (877661435611) 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 3 ways as a sum of consecutive naturals, for example, 146276905936 + ... + 146276905941.

It is an arithmetic number, because the mean of its divisors is an integer number (292553811878).

Almost surely, 2^877661435631 is an apocalyptic number.

877661435631 is a deficient number, since it is larger than the sum of its proper divisors (292553811881).

877661435631 is a wasteful number, since it uses less digits than its factorization.

877661435631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292553811880.

The product of its digits is 15240960, while the sum is 57.

The spelling of 877661435631 in words is "eight hundred seventy-seven billion, six hundred sixty-one million, four hundred thirty-five thousand, six hundred thirty-one".