664920497 has 16 divisors (see below), whose sum is σ = 696038400. Its totient is φ = 634401600.

The previous prime is 664920479. The next prime is 664920527. The reversal of 664920497 is 794029466.

It is a happy number.

664920497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 664920497 - 2¹² = 664916401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664922497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1387904 + ... + 1388382.

It is an arithmetic number, because the mean of its divisors is an integer number (43502400).

Almost surely, 2^664920497 is an apocalyptic number.

It is an amenable number.

664920497 is a deficient number, since it is larger than the sum of its proper divisors (31117903).

664920497 is a wasteful number, since it uses less digits than its factorization.

664920497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 664920497 is about 25786.0523733277. The cubic root of 664920497 is about 872.8170880007.

The spelling of 664920497 in words is "six hundred sixty-four million, nine hundred twenty thousand, four hundred ninety-seven".