668466508444525 has 144 divisors (see below), whose sum is σ = 997039750371840. Its totient is φ = 442830546547200.

The previous prime is 668466508444523. The next prime is 668466508444627. The reversal of 668466508444525 is 525444805664866.

It is not a de Polignac number, because 668466508444525 - 2¹ = 668466508444523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668466508444523) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 129072503386 + ... + 129072508564.

It is an arithmetic number, because the mean of its divisors is an integer number (6923887155360).

Almost surely, 2^{668466508444525} is an apocalyptic number.

It is an amenable number.

668466508444525 is a deficient number, since it is larger than the sum of its proper divisors (328573241927315).

668466508444525 is a wasteful number, since it uses less digits than its factorization.

668466508444525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10404 (or 10392 counting only the distinct ones).

The product of its (nonzero) digits is 5308416000, while the sum is 73.

The spelling of 668466508444525 in words is "six hundred sixty-eight trillion, four hundred sixty-six billion, five hundred eight million, four hundred forty-four thousand, five hundred twenty-five".