668699641 has 8 divisors (see below), whose sum is σ = 709909920. Its totient is φ = 627697728.

The previous prime is 668699621. The next prime is 668699663. The reversal of 668699641 is 146996866.

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 668699641 - 2⁵ = 668699609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668699621) 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, 45451 + ... + 58336.

It is an arithmetic number, because the mean of its divisors is an integer number (88738740).

Almost surely, 2^668699641 is an apocalyptic number.

It is an amenable number.

668699641 is a deficient number, since it is larger than the sum of its proper divisors (41210279).

668699641 is a wasteful number, since it uses less digits than its factorization.

668699641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104183.

The product of its digits is 3359232, while the sum is 55.

The square root of 668699641 is about 25859.2273859835. The cubic root of 668699641 is about 874.4675469702.

The spelling of 668699641 in words is "six hundred sixty-eight million, six hundred ninety-nine thousand, six hundred forty-one".