665061215 has 64 divisors (see below), whose sum is σ = 1036578816. Its totient is φ = 398103552.

The previous prime is 665061181. The next prime is 665061247. The reversal of 665061215 is 512160566.

It is not a de Polignac number, because 665061215 - 2¹⁰ = 665060191 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1077587 + ... + 1078203.

It is an arithmetic number, because the mean of its divisors is an integer number (16196544).

Almost surely, 2^665061215 is an apocalyptic number.

665061215 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

665061215 is a deficient number, since it is larger than the sum of its proper divisors (371517601).

665061215 is a wasteful number, since it uses less digits than its factorization.

665061215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 665061215 is about 25788.7807970831. The cubic root of 665061215 is about 872.8786554675.

The spelling of 665061215 in words is "six hundred sixty-five million, sixty-one thousand, two hundred fifteen".