665850807915 has 32 divisors (see below), whose sum is σ = 1085610427200. Its totient is φ = 348400657920.

The previous prime is 665850807901. The next prime is 665850807931. The reversal of 665850807915 is 519708058566.

665850807915 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665850807915 - 2⁴ = 665850807899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 579420 + ... + 1291289.

It is an arithmetic number, because the mean of its divisors is an integer number (33925325850).

Almost surely, 2^665850807915 is an apocalyptic number.

665850807915 is a deficient number, since it is larger than the sum of its proper divisors (419759619285).

665850807915 is a wasteful number, since it uses less digits than its factorization.

665850807915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871167.

The product of its (nonzero) digits is 18144000, while the sum is 60.

The spelling of 665850807915 in words is "six hundred sixty-five billion, eight hundred fifty million, eight hundred seven thousand, nine hundred fifteen".