667466421568 has 56 divisors (see below), whose sum is σ = 1336928552960. Its totient is φ = 330603793920.

The previous prime is 667466421553. The next prime is 667466421571. The reversal of 667466421568 is 865124664766.

It is a super-2 number, since 2×667466421568² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66008833 + ... + 66018943.

It is an arithmetic number, because the mean of its divisors is an integer number (23873724160).

Almost surely, 2^667466421568 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 667466421568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (668464276480).

667466421568 is an abundant number, since it is smaller than the sum of its proper divisors (669462131392).

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

667466421568 is a wasteful number, since it uses less digits than its factorization.

667466421568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19695 (or 19685 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 61.

The spelling of 667466421568 in words is "six hundred sixty-seven billion, four hundred sixty-six million, four hundred twenty-one thousand, five hundred sixty-eight".