666515206065 has 32 divisors (see below), whose sum is σ = 1086768368640. Its totient is φ = 348696182016.

The previous prime is 666515206057. The next prime is 666515206067. The reversal of 666515206065 is 560602515666.

It is not a de Polignac number, because 666515206065 - 2³ = 666515206057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666515206067) 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, 3909831 + ... + 4076739.

It is an arithmetic number, because the mean of its divisors is an integer number (33961511520).

Almost surely, 2^666515206065 is an apocalyptic number.

It is an amenable number.

666515206065 is a deficient number, since it is larger than the sum of its proper divisors (420253162575).

666515206065 is a wasteful number, since it uses less digits than its factorization.

666515206065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171993.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 666515206065 in words is "six hundred sixty-six billion, five hundred fifteen million, two hundred six thousand, sixty-five".