87163777631 has 4 divisors (see below), whose sum is σ = 99615745872. Its totient is φ = 74711809392.

The previous prime is 87163777627. The next prime is 87163777651. The reversal of 87163777631 is 13677736178.

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

It is a cyclic number.

It is not a de Polignac number, because 87163777631 - 2² = 87163777627 is a prime.

It is a super-2 number, since 2×87163777631² (a number of 23 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 (87163777651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6225984110 + ... + 6225984123.

It is an arithmetic number, because the mean of its divisors is an integer number (24903936468).

Almost surely, 2^87163777631 is an apocalyptic number.

87163777631 is a deficient number, since it is larger than the sum of its proper divisors (12451968241).

87163777631 is a wasteful number, since it uses less digits than its factorization.

87163777631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12451968240.

The product of its digits is 6223392, while the sum is 56.

The spelling of 87163777631 in words is "eighty-seven billion, one hundred sixty-three million, seven hundred seventy-seven thousand, six hundred thirty-one".