668622782324 has 48 divisors (see below), whose sum is σ = 1348246867968. Its totient is φ = 284204810208.

The previous prime is 668622782309. The next prime is 668622782353. The reversal of 668622782324 is 423287226866.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 668622782324.

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, 1471637 + ... + 1871619.

It is an arithmetic number, because the mean of its divisors is an integer number (28088476416).

Almost surely, 2^668622782324 is an apocalyptic number.

It is an amenable number.

668622782324 is an abundant number, since it is smaller than the sum of its proper divisors (679624085644).

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

668622782324 is a wasteful number, since it uses less digits than its factorization.

668622782324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400484 (or 400482 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 56.

The spelling of 668622782324 in words is "six hundred sixty-eight billion, six hundred twenty-two million, seven hundred eighty-two thousand, three hundred twenty-four".