66189690579 has 16 divisors (see below), whose sum is σ = 91477827584. Its totient is φ = 42525820800.

The previous prime is 66189690563. The next prime is 66189690649. The reversal of 66189690579 is 97509698166.

It is a happy number.

It is not a de Polignac number, because 66189690579 - 2⁴ = 66189690563 is a prime.

It is a super-2 number, since 2×66189690579² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66189690079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1454179 + ... + 1499004.

It is an arithmetic number, because the mean of its divisors is an integer number (5717364224).

Almost surely, 2^66189690579 is an apocalyptic number.

66189690579 is a deficient number, since it is larger than the sum of its proper divisors (25288137005).

66189690579 is a wasteful number, since it uses less digits than its factorization.

66189690579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953458.

The product of its (nonzero) digits is 44089920, while the sum is 66.

The spelling of 66189690579 in words is "sixty-six billion, one hundred eighty-nine million, six hundred ninety thousand, five hundred seventy-nine".