78558223166631 has 72 divisors (see below), whose sum is σ = 125015999322240. Its totient is φ = 47501211955392.

The previous prime is 78558223166617. The next prime is 78558223166651. The reversal of 78558223166631 is 13666132285587.

It is not a de Polignac number, because 78558223166631 - 2²¹ = 78558221069479 is a prime.

It is a super-2 number, since 2×78558223166631² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78558223166651) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 186716206 + ... + 187136468.

It is an arithmetic number, because the mean of its divisors is an integer number (1736333323920).

Almost surely, 2^{78558223166631} is an apocalyptic number.

78558223166631 is a deficient number, since it is larger than the sum of its proper divisors (46457776155609).

78558223166631 is a wasteful number, since it uses less digits than its factorization.

78558223166631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422437 (or 422421 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 63.

The spelling of 78558223166631 in words is "seventy-eight trillion, five hundred fifty-eight billion, two hundred twenty-three million, one hundred sixty-six thousand, six hundred thirty-one".