666634140605 has 16 divisors (see below), whose sum is σ = 800964806400. Its totient is φ = 532638288000.

The previous prime is 666634140577. The next prime is 666634140671. The reversal of 666634140605 is 506041436666.

It is not a de Polignac number, because 666634140605 - 2¹⁰ = 666634139581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666634140605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51269105 + ... + 51282105.

It is an arithmetic number, because the mean of its divisors is an integer number (50060300400).

Almost surely, 2^666634140605 is an apocalyptic number.

It is an amenable number.

666634140605 is a deficient number, since it is larger than the sum of its proper divisors (134330665795).

666634140605 is a wasteful number, since it uses less digits than its factorization.

666634140605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25084.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 666634140605 in words is "six hundred sixty-six billion, six hundred thirty-four million, one hundred forty thousand, six hundred five".