66937979545 has 16 divisors (see below), whose sum is σ = 84564720000. Its totient is φ = 50725052928.

The previous prime is 66937979489. The next prime is 66937979579. The reversal of 66937979545 is 54597973966.

It is a cyclic number.

It is not a de Polignac number, because 66937979545 - 2²⁹ = 66401108633 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 719881 + ... + 807529.

It is an arithmetic number, because the mean of its divisors is an integer number (5285295000).

Almost surely, 2^66937979545 is an apocalyptic number.

It is an amenable number.

66937979545 is a deficient number, since it is larger than the sum of its proper divisors (17626740455).

66937979545 is a wasteful number, since it uses less digits than its factorization.

66937979545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95712.

The product of its digits is 385786800, while the sum is 70.

The spelling of 66937979545 in words is "sixty-six billion, nine hundred thirty-seven million, nine hundred seventy-nine thousand, five hundred forty-five".