668593137 has 8 divisors (see below), whose sum is σ = 902198304. Its totient is φ = 440358368.

The previous prime is 668593129. The next prime is 668593193. The reversal of 668593137 is 731395866.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668593137 - 2³ = 668593129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668593537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1342308 + ... + 1342805.

It is an arithmetic number, because the mean of its divisors is an integer number (112774788).

Almost surely, 2^668593137 is an apocalyptic number.

It is an amenable number.

668593137 is a deficient number, since it is larger than the sum of its proper divisors (233605167).

668593137 is a wasteful number, since it uses less digits than its factorization.

668593137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685199.

The product of its digits is 816480, while the sum is 48.

The square root of 668593137 is about 25857.1680003824. The cubic root of 668593137 is about 874.4211189324.

It can be divided in two parts, 66859 and 3137, that added together give a palindrome (69996).

The spelling of 668593137 in words is "six hundred sixty-eight million, five hundred ninety-three thousand, one hundred thirty-seven".