87636622663679 has 4 divisors (see below), whose sum is σ = 87645352290480. Its totient is φ = 87627893036880.

The previous prime is 87636622663669. The next prime is 87636622663687. The reversal of 87636622663679 is 97636622663678.

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 87636622663679 - 2⁴ = 87636622663663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87636622663609) 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, 4364798342 + ... + 4364818419.

It is an arithmetic number, because the mean of its divisors is an integer number (21911338072620).

Almost surely, 2^{87636622663679} is an apocalyptic number.

87636622663679 is a deficient number, since it is larger than the sum of its proper divisors (8729626801).

87636622663679 is a wasteful number, since it uses less digits than its factorization.

87636622663679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8729626800.

The product of its digits is 5925685248, while the sum is 77.

Subtracting 87636622663679 from its reverse (97636622663678), we obtain a palindrome (9999999999999).

The spelling of 87636622663679 in words is "eighty-seven trillion, six hundred thirty-six billion, six hundred twenty-two million, six hundred sixty-three thousand, six hundred seventy-nine".