665061515 has 8 divisors (see below), whose sum is σ = 815054400. Its totient is φ = 520728832.

The previous prime is 665061493. The next prime is 665061581. The reversal of 665061515 is 515160566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665061515 - 2¹⁴ = 665045131 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1414790 + ... + 1415259.

It is an arithmetic number, because the mean of its divisors is an integer number (101881800).

Almost surely, 2^665061515 is an apocalyptic number.

665061515 is a deficient number, since it is larger than the sum of its proper divisors (149992885).

665061515 is a wasteful number, since it uses less digits than its factorization.

665061515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830101.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 665061515 is about 25788.7866135652. The cubic root of 665061515 is about 872.8787867153.

The spelling of 665061515 in words is "six hundred sixty-five million, sixty-one thousand, five hundred fifteen".