665605515 has 8 divisors (see below), whose sum is σ = 1064968848. Its totient is φ = 354989600.

The previous prime is 665605483. The next prime is 665605547. The reversal of 665605515 is 515506566.

It is an interprime number because it is at equal distance from previous prime (665605483) and next prime (665605547).

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

It is not a de Polignac number, because 665605515 - 2⁵ = 665605483 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, 22186836 + ... + 22186865.

It is an arithmetic number, because the mean of its divisors is an integer number (133121106).

Almost surely, 2^665605515 is an apocalyptic number.

665605515 is a deficient number, since it is larger than the sum of its proper divisors (399363333).

665605515 is a wasteful number, since it uses less digits than its factorization.

665605515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44373709.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 665605515 is about 25799.3316773904. The cubic root of 665605515 is about 873.1167179133.

The spelling of 665605515 in words is "six hundred sixty-five million, six hundred five thousand, five hundred fifteen".