665510101015 has 4 divisors (see below), whose sum is σ = 798612121224. Its totient is φ = 532408080808.

The previous prime is 665510101007. The next prime is 665510101057. The reversal of 665510101015 is 510101015566.

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 665510101015 - 2³ = 665510101007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66551010097 + ... + 66551010106.

It is an arithmetic number, because the mean of its divisors is an integer number (199653030306).

Almost surely, 2^665510101015 is an apocalyptic number.

665510101015 is a deficient number, since it is larger than the sum of its proper divisors (133102020209).

665510101015 is a wasteful number, since it uses less digits than its factorization.

665510101015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133102020208.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 665510101015 in words is "six hundred sixty-five billion, five hundred ten million, one hundred one thousand, fifteen".