668009954644 has 12 divisors (see below), whose sum is σ = 1170807650964. Its totient is φ = 333493482944.

The previous prime is 668009954629. The next prime is 668009954659. The reversal of 668009954644 is 446459900866.

It is an interprime number because it is at equal distance from previous prime (668009954629) and next prime (668009954659).

It can be written as a sum of positive squares in 2 ways, for example, as 139681587600 + 528328367044 = 373740^2 + 726862^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127870657 + ... + 127875880.

It is an arithmetic number, because the mean of its divisors is an integer number (97567304247).

Almost surely, 2^668009954644 is an apocalyptic number.

It is an amenable number.

668009954644 is a deficient number, since it is larger than the sum of its proper divisors (502797696320).

668009954644 is a wasteful number, since it uses less digits than its factorization.

668009954644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255747194 (or 255747192 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 61.

The spelling of 668009954644 in words is "six hundred sixty-eight billion, nine million, nine hundred fifty-four thousand, six hundred forty-four".