666512266504 has 128 divisors (see below), whose sum is σ = 1550340933120. Its totient is φ = 262084608000.

The previous prime is 666512266489. The next prime is 666512266513. The reversal of 666512266504 is 405662215666.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56473404 + ... + 56485204.

It is an arithmetic number, because the mean of its divisors is an integer number (12112038540).

Almost surely, 2^666512266504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666512266504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (775170466560).

666512266504 is an abundant number, since it is smaller than the sum of its proper divisors (883828666616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666512266504 is a wasteful number, since it uses less digits than its factorization.

666512266504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13319 (or 13315 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 666512266504 in words is "six hundred sixty-six billion, five hundred twelve million, two hundred sixty-six thousand, five hundred four".