668756193 has 16 divisors (see below), whose sum is σ = 1019612160. Its totient is φ = 381938256.

The previous prime is 668756189. The next prime is 668756203. The reversal of 668756193 is 391657866.

It is not a de Polignac number, because 668756193 - 2² = 668756189 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668756393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36198 + ... + 51456.

It is an arithmetic number, because the mean of its divisors is an integer number (63725760).

Almost surely, 2^668756193 is an apocalyptic number.

It is an amenable number.

668756193 is a deficient number, since it is larger than the sum of its proper divisors (350855967).

668756193 is a wasteful number, since it uses less digits than its factorization.

668756193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17356.

The product of its digits is 1632960, while the sum is 51.

The square root of 668756193 is about 25860.3208216758. The cubic root of 668756193 is about 874.4921975465.

The spelling of 668756193 in words is "six hundred sixty-eight million, seven hundred fifty-six thousand, one hundred ninety-three".