668009954628 has 18 divisors (see below), whose sum is σ = 1688580718734. Its totient is φ = 222669984864.

The previous prime is 668009954581. The next prime is 668009954629. The reversal of 668009954628 is 826459900866.

668009954628 is a `hidden beast` number, since 6 + 6 + 80 + 0 + 9 + 9 + 546 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 611661639744 + 56348314884 = 782088^2 + 237378^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (668009954629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9277916001 + ... + 9277916072.

Almost surely, 2^668009954628 is an apocalyptic number.

It is an amenable number.

668009954628 is an abundant number, since it is smaller than the sum of its proper divisors (1020570764106).

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

668009954628 is a wasteful number, since it uses less digits than its factorization.

668009954628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18555832083 (or 18555832078 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 668009954628 in words is "six hundred sixty-eight billion, nine million, nine hundred fifty-four thousand, six hundred twenty-eight".