66178631864506 has 16 divisors (see below), whose sum is σ = 113519680050816. Its totient is φ = 28344621585456.

The previous prime is 66178631864489. The next prime is 66178631864537. The reversal of 66178631864506 is 60546813687166.

It is a happy number.

It is a super-2 number, since 2×66178631864506² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1470744501 + ... + 1470789496.

It is an arithmetic number, because the mean of its divisors is an integer number (7094980003176).

Almost surely, 2^{66178631864506} is an apocalyptic number.

66178631864506 is a deficient number, since it is larger than the sum of its proper divisors (47341048186310).

66178631864506 is a wasteful number, since it uses less digits than its factorization.

66178631864506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941535613.

The product of its (nonzero) digits is 209018880, while the sum is 67.

The spelling of 66178631864506 in words is "sixty-six trillion, one hundred seventy-eight billion, six hundred thirty-one million, eight hundred sixty-four thousand, five hundred six".