66312164365 has 4 divisors (see below), whose sum is σ = 79574597244. Its totient is φ = 53049731488.

The previous prime is 66312164329. The next prime is 66312164377. The reversal of 66312164365 is 56346121366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51378835561 + 14933328804 = 226669^2 + 122202^2 .

It is a cyclic number.

It is not a de Polignac number, because 66312164365 - 2¹⁵ = 66312131597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6631216432 + ... + 6631216441.

It is an arithmetic number, because the mean of its divisors is an integer number (19893649311).

Almost surely, 2^66312164365 is an apocalyptic number.

It is an amenable number.

66312164365 is a deficient number, since it is larger than the sum of its proper divisors (13262432879).

66312164365 is a wasteful number, since it uses less digits than its factorization.

66312164365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13262432878.

The product of its digits is 466560, while the sum is 43.

The spelling of 66312164365 in words is "sixty-six billion, three hundred twelve million, one hundred sixty-four thousand, three hundred sixty-five".