66666577074919 has 8 divisors (see below), whose sum is σ = 66727972048608. Its totient is φ = 66605185164960.

The previous prime is 66666577074901. The next prime is 66666577074973. The reversal of 66666577074919 is 91947077566666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66666577074919 - 2¹⁵ = 66666577042151 is a prime.

It is a super-2 number, since 2×66666577074919² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666577074719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43975974 + ... + 45466684.

It is an arithmetic number, because the mean of its divisors is an integer number (8340996506076).

Almost surely, 2^{66666577074919} is an apocalyptic number.

66666577074919 is a deficient number, since it is larger than the sum of its proper divisors (61394973689).

66666577074919 is a wasteful number, since it uses less digits than its factorization.

66666577074919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531865.

The product of its (nonzero) digits is 4320812160, while the sum is 79.

The spelling of 66666577074919 in words is "sixty-six trillion, six hundred sixty-six billion, five hundred seventy-seven million, seventy-four thousand, nine hundred nineteen".