665611315 has 16 divisors (see below), whose sum is σ = 825391008. Its totient is φ = 514895616.

The previous prime is 665611301. The next prime is 665611351. The reversal of 665611315 is 513116566.

It is a cyclic number.

It is not a de Polignac number, because 665611315 - 2¹⁵ = 665578547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19119 + ... + 41191.

It is an arithmetic number, because the mean of its divisors is an integer number (51586938).

Almost surely, 2^665611315 is an apocalyptic number.

665611315 is a deficient number, since it is larger than the sum of its proper divisors (159779693).

665611315 is a wasteful number, since it uses less digits than its factorization.

665611315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22278.

The product of its digits is 16200, while the sum is 34.

The square root of 665611315 is about 25799.4440831581. Note that the first 3 decimals coincide. The cubic root of 665611315 is about 873.1192539811.

It can be divided in two parts, 66561 and 1315, that added together give a palindrome (67876).

The spelling of 665611315 in words is "six hundred sixty-five million, six hundred eleven thousand, three hundred fifteen".