660665516655 has 16 divisors (see below), whose sum is σ = 1061084090880. Its totient is φ = 351015187488.

The previous prime is 660665516627. The next prime is 660665516669. The reversal of 660665516655 is 556615566066.

It is not a de Polignac number, because 660665516655 - 2¹⁸ = 660665254511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 660665516595 and 660665516604.

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, 83730595 + ... + 83738484.

It is an arithmetic number, because the mean of its divisors is an integer number (66317755680).

Almost surely, 2^660665516655 is an apocalyptic number.

660665516655 is a deficient number, since it is larger than the sum of its proper divisors (400418574225).

660665516655 is a wasteful number, since it uses less digits than its factorization.

660665516655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167469350.

The product of its (nonzero) digits is 29160000, while the sum is 57.

The spelling of 660665516655 in words is "six hundred sixty billion, six hundred sixty-five million, five hundred sixteen thousand, six hundred fifty-five".