64140569879 has 4 divisors (see below), whose sum is σ = 64225300584. Its totient is φ = 64055839176.

The previous prime is 64140569833. The next prime is 64140569893. The reversal of 64140569879 is 97896504146.

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

It is a cyclic number.

It is not a de Polignac number, because 64140569879 - 2¹⁶ = 64140504343 is a prime.

It is a super-2 number, since 2×64140569879² (a number of 22 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 (64140569819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42364217 + ... + 42365730.

It is an arithmetic number, because the mean of its divisors is an integer number (16056325146).

Almost surely, 2^64140569879 is an apocalyptic number.

64140569879 is a deficient number, since it is larger than the sum of its proper divisors (84730705).

64140569879 is an equidigital number, since it uses as much as digits as its factorization.

64140569879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84730704.

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 64140569879 in words is "sixty-four billion, one hundred forty million, five hundred sixty-nine thousand, eight hundred seventy-nine".