660279899879 has 4 divisors (see below), whose sum is σ = 681579251520. Its totient is φ = 638980548240.

The previous prime is 660279899857. The next prime is 660279899891. The reversal of 660279899879 is 978998972066.

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 660279899879 - 2⁸ = 660279899623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660279899809) 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, 10649675774 + ... + 10649675835.

It is an arithmetic number, because the mean of its divisors is an integer number (170394812880).

Almost surely, 2^660279899879 is an apocalyptic number.

660279899879 is a deficient number, since it is larger than the sum of its proper divisors (21299351641).

660279899879 is a wasteful number, since it uses less digits than its factorization.

660279899879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21299351640.

The product of its (nonzero) digits is 1481421312, while the sum is 80.

The spelling of 660279899879 in words is "six hundred sixty billion, two hundred seventy-nine million, eight hundred ninety-nine thousand, eight hundred seventy-nine".