66136565664464 has 80 divisors (see below), whose sum is σ = 131624248901760. Its totient is φ = 32182584698880.

The previous prime is 66136565664451. The next prime is 66136565664479. The reversal of 66136565664464 is 46446656563166.

It is a junction number, because it is equal to n+sod(n) for n = 66136565664394 and 66136565664403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49971419 + ... + 51277829.

It is an arithmetic number, because the mean of its divisors is an integer number (1645303111272).

Almost surely, 2^{66136565664464} is an apocalyptic number.

It is an amenable number.

66136565664464 is a deficient number, since it is larger than the sum of its proper divisors (65487683237296).

66136565664464 is a wasteful number, since it uses less digits than its factorization.

66136565664464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307068 (or 1307062 counting only the distinct ones).

The product of its digits is 1343692800, while the sum is 68.

The spelling of 66136565664464 in words is "sixty-six trillion, one hundred thirty-six billion, five hundred sixty-five million, six hundred sixty-four thousand, four hundred sixty-four".