668856758 has 4 divisors (see below), whose sum is σ = 1003285140. Its totient is φ = 334428378.

The previous prime is 668856751. The next prime is 668856817. The reversal of 668856758 is 857658866.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 668856697 and 668856706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668856751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167214188 + ... + 167214191.

It is an arithmetic number, because the mean of its divisors is an integer number (250821285).

Almost surely, 2^668856758 is an apocalyptic number.

668856758 is a deficient number, since it is larger than the sum of its proper divisors (334428382).

668856758 is a wasteful number, since it uses less digits than its factorization.

668856758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334428381.

The product of its digits is 19353600, while the sum is 59.

The square root of 668856758 is about 25862.2651366813. The cubic root of 668856758 is about 874.5360296142.

The spelling of 668856758 in words is "six hundred sixty-eight million, eight hundred fifty-six thousand, seven hundred fifty-eight".