66510616165 has 16 divisors (see below), whose sum is σ = 91219190400. Its totient is φ = 45604964160.

The previous prime is 66510616129. The next prime is 66510616181. The reversal of 66510616165 is 56161601566.

It is not a de Polignac number, because 66510616165 - 2⁷ = 66510616037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 930886 + ... + 999784.

It is an arithmetic number, because the mean of its divisors is an integer number (5701199400).

Almost surely, 2^66510616165 is an apocalyptic number.

It is an amenable number.

66510616165 is a deficient number, since it is larger than the sum of its proper divisors (24708574235).

66510616165 is a wasteful number, since it uses less digits than its factorization.

66510616165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96492.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 66510616165 in words is "sixty-six billion, five hundred ten million, six hundred sixteen thousand, one hundred sixty-five".