666256652666 has 128 divisors (see below), whose sum is σ = 1196853166080. Its totient is φ = 274803840000.

The previous prime is 666256652641. The next prime is 666256652669.

666256652666 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a junction number, because it is equal to n+sod(n) for n = 666256652599 and 666256652608.

It is not an unprimeable number, because it can be changed into a prime (666256652669) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 596469140 + ... + 596470256.

It is an arithmetic number, because the mean of its divisors is an integer number (9350415360).

Almost surely, 2^666256652666 is an apocalyptic number.

666256652666 is a deficient number, since it is larger than the sum of its proper divisors (530596513414).

666256652666 is a wasteful number, since it uses less digits than its factorization.

666256652666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612.

The product of its digits is 167961600, while the sum is 62.

The spelling of 666256652666 in words is "six hundred sixty-six billion, two hundred fifty-six million, six hundred fifty-two thousand, six hundred sixty-six".