668128345 has 8 divisors (see below), whose sum is σ = 802037376. Its totient is φ = 534313776.

The previous prime is 668128327. The next prime is 668128393. The reversal of 668128345 is 543821866.

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 668128345 - 2²⁷ = 533910617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6987 + ... + 37216.

It is an arithmetic number, because the mean of its divisors is an integer number (100254672).

Almost surely, 2^668128345 is an apocalyptic number.

It is an amenable number.

668128345 is a deficient number, since it is larger than the sum of its proper divisors (133909031).

668128345 is a wasteful number, since it uses less digits than its factorization.

668128345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47231.

The product of its digits is 276480, while the sum is 43.

The square root of 668128345 is about 25848.1787559588. The cubic root of 668128345 is about 874.2184455207.

It can be divided in two parts, 66812 and 8345, that added together give a palindrome (75157).

The spelling of 668128345 in words is "six hundred sixty-eight million, one hundred twenty-eight thousand, three hundred forty-five".