665653515 has 32 divisors (see below), whose sum is σ = 1074318336. Its totient is φ = 351941760.

The previous prime is 665653487. The next prime is 665653519. The reversal of 665653515 is 515356566.

It is not a de Polignac number, because 665653515 - 2¹⁴ = 665637131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665653519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1366602 + ... + 1367088.

It is an arithmetic number, because the mean of its divisors is an integer number (33572448).

Almost surely, 2^665653515 is an apocalyptic number.

665653515 is a deficient number, since it is larger than the sum of its proper divisors (408664821).

665653515 is a wasteful number, since it uses less digits than its factorization.

665653515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099.

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

The square root of 665653515 is about 25800.2619172752. The cubic root of 665653515 is about 873.1377056175.

The spelling of 665653515 in words is "six hundred sixty-five million, six hundred fifty-three thousand, five hundred fifteen".