668700497 has 8 divisors (see below), whose sum is σ = 710866560. Its totient is φ = 627231600.

The previous prime is 668700493. The next prime is 668700509. The reversal of 668700497 is 794007866.

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 668700497 - 2² = 668700493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668700493) 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, 172313 + ... + 176150.

It is an arithmetic number, because the mean of its divisors is an integer number (88858320).

Almost surely, 2^668700497 is an apocalyptic number.

It is an amenable number.

668700497 is a deficient number, since it is larger than the sum of its proper divisors (42166063).

668700497 is a wasteful number, since it uses less digits than its factorization.

668700497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348583.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 668700497 is about 25859.2439371301. The cubic root of 668700497 is about 874.4679201043.

The spelling of 668700497 in words is "six hundred sixty-eight million, seven hundred thousand, four hundred ninety-seven".