668497823 has 8 divisors (see below), whose sum is σ = 781765248. Its totient is φ = 559672344.

The previous prime is 668497807. The next prime is 668497831. The reversal of 668497823 is 328794866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668497823 - 2⁴ = 668497807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668497883) 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, 1110161 + ... + 1110762.

It is an arithmetic number, because the mean of its divisors is an integer number (97720656).

Almost surely, 2^668497823 is an apocalyptic number.

668497823 is a deficient number, since it is larger than the sum of its proper divisors (113267425).

668497823 is a wasteful number, since it uses less digits than its factorization.

668497823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220973.

The product of its digits is 3483648, while the sum is 53.

The square root of 668497823 is about 25855.3248480850. The cubic root of 668497823 is about 874.3795647441.

The spelling of 668497823 in words is "six hundred sixty-eight million, four hundred ninety-seven thousand, eight hundred twenty-three".