668923137 has 8 divisors (see below), whose sum is σ = 990997280. Its totient is φ = 445948740.

The previous prime is 668923103. The next prime is 668923141. The reversal of 668923137 is 731329866.

It is not a de Polignac number, because 668923137 - 2¹⁹ = 668398849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668923092 and 668923101.

It is not an unprimeable number, because it can be changed into a prime (668913137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12387439 + ... + 12387492.

It is an arithmetic number, because the mean of its divisors is an integer number (123874660).

Almost surely, 2^668923137 is an apocalyptic number.

It is an amenable number.

668923137 is a deficient number, since it is larger than the sum of its proper divisors (322074143).

668923137 is a wasteful number, since it uses less digits than its factorization.

668923137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24774940 (or 24774934 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 668923137 is about 25863.5484224420. The cubic root of 668923137 is about 874.5649590305.

The spelling of 668923137 in words is "six hundred sixty-eight million, nine hundred twenty-three thousand, one hundred thirty-seven".