665655315 has 64 divisors (see below), whose sum is σ = 1225881216. Its totient is φ = 305528832.

The previous prime is 665655311. The next prime is 665655323. The reversal of 665655315 is 513556566.

It is not a de Polignac number, because 665655315 - 2² = 665655311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665655311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 373707 + ... + 375483.

It is an arithmetic number, because the mean of its divisors is an integer number (19154394).

Almost surely, 2^665655315 is an apocalyptic number.

665655315 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

665655315 is a deficient number, since it is larger than the sum of its proper divisors (560225901).

665655315 is a wasteful number, since it uses less digits than its factorization.

665655315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928.

The product of its digits is 405000, while the sum is 42.

The square root of 665655315 is about 25800.2968006184. The cubic root of 665655315 is about 873.1384926368.

The spelling of 665655315 in words is "six hundred sixty-five million, six hundred fifty-five thousand, three hundred fifteen".