66299558631 has 16 divisors (see below), whose sum is σ = 91481647488. Its totient is φ = 42676826400.

The previous prime is 66299558627. The next prime is 66299558659. The reversal of 66299558631 is 13685599266.

It is not a de Polignac number, because 66299558631 - 2² = 66299558627 is a prime.

It is a super-2 number, since 2×66299558631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66299558621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2265205 + ... + 2294286.

It is an arithmetic number, because the mean of its divisors is an integer number (5717602968).

Almost surely, 2^66299558631 is an apocalyptic number.

66299558631 is a deficient number, since it is larger than the sum of its proper divisors (25182088857).

66299558631 is a wasteful number, since it uses less digits than its factorization.

66299558631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4559662.

The product of its digits is 20995200, while the sum is 60.

The spelling of 66299558631 in words is "sixty-six billion, two hundred ninety-nine million, five hundred fifty-eight thousand, six hundred thirty-one".