666526625666 has 16 divisors (see below), whose sum is σ = 1091244244608. Its totient is φ = 302809894800.

The previous prime is 666526625651. The next prime is 666526625693.

666526625666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666526625599 and 666526625608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7794170 + ... + 7879221.

It is an arithmetic number, because the mean of its divisors is an integer number (68202765288).

Almost surely, 2^666526625666 is an apocalyptic number.

666526625666 is a deficient number, since it is larger than the sum of its proper divisors (424717618942).

666526625666 is a wasteful number, since it uses less digits than its factorization.

666526625666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15675337.

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

The spelling of 666526625666 in words is "six hundred sixty-six billion, five hundred twenty-six million, six hundred twenty-five thousand, six hundred sixty-six".