78795511631 has 4 divisors (see below), whose sum is σ = 79235710200. Its totient is φ = 78355313064.

The previous prime is 78795511559. The next prime is 78795511679. The reversal of 78795511631 is 13611559787.

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 78795511631 - 2¹⁸ = 78795249487 is a prime.

It is a super-2 number, since 2×78795511631² (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 (78795511031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220099016 + ... + 220099373.

It is an arithmetic number, because the mean of its divisors is an integer number (19808927550).

Almost surely, 2^78795511631 is an apocalyptic number.

78795511631 is a deficient number, since it is larger than the sum of its proper divisors (440198569).

78795511631 is a wasteful number, since it uses less digits than its factorization.

78795511631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440198568.

The product of its digits is 1587600, while the sum is 53.

The spelling of 78795511631 in words is "seventy-eight billion, seven hundred ninety-five million, five hundred eleven thousand, six hundred thirty-one".