669315836879 has 4 divisors (see below), whose sum is σ = 669317473680. Its totient is φ = 669314200080.

The previous prime is 669315836759. The next prime is 669315836971. The reversal of 669315836879 is 978638513966.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669315836879 is a prime.

It is a super-2 number, since 2×669315836879² (a number of 24 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 (669315836479) 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, 376934 + ... + 1216844.

It is an arithmetic number, because the mean of its divisors is an integer number (167329368420).

Almost surely, 2^669315836879 is an apocalyptic number.

669315836879 is a deficient number, since it is larger than the sum of its proper divisors (1636801).

669315836879 is an equidigital number, since it uses as much as digits as its factorization.

669315836879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636800.

The product of its digits is 352719360, while the sum is 71.

The spelling of 669315836879 in words is "six hundred sixty-nine billion, three hundred fifteen million, eight hundred thirty-six thousand, eight hundred seventy-nine".