668353905189 has 12 divisors (see below), whose sum is σ = 1007374002336. Its totient is φ = 426196693032.

The previous prime is 668353905181. The next prime is 668353905199. The reversal of 668353905189 is 981509353866.

668353905189 is a `hidden beast` number, since 6 + 6 + 83 + 5 + 39 + 0 + 518 + 9 = 666.

It is not a de Polignac number, because 668353905189 - 2³ = 668353905181 is a prime.

It is a super-2 number, since 2×668353905189² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668353905181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1614381207 + ... + 1614381620.

It is an arithmetic number, because the mean of its divisors is an integer number (83947833528).

Almost surely, 2^668353905189 is an apocalyptic number.

668353905189 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

668353905189 is a deficient number, since it is larger than the sum of its proper divisors (339020097147).

668353905189 is a wasteful number, since it uses less digits than its factorization.

668353905189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3228762856 (or 3228762853 counting only the distinct ones).

The product of its (nonzero) digits is 41990400, while the sum is 63.

The spelling of 668353905189 in words is "six hundred sixty-eight billion, three hundred fifty-three million, nine hundred five thousand, one hundred eighty-nine".