664240897 has 8 divisors (see below), whose sum is σ = 696997440. Its totient is φ = 631807440.

The previous prime is 664240879. The next prime is 664240901. The reversal of 664240897 is 798042466.

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 a de Polignac number, because none of the positive numbers 2^k-664240897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664240807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76554 + ... + 84787.

It is an arithmetic number, because the mean of its divisors is an integer number (87124680).

Almost surely, 2^664240897 is an apocalyptic number.

It is an amenable number.

664240897 is a deficient number, since it is larger than the sum of its proper divisors (32756543).

664240897 is a wasteful number, since it uses less digits than its factorization.

664240897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161543.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 664240897 is about 25772.8713379010. The cubic root of 664240897 is about 872.5196245206.

The spelling of 664240897 in words is "six hundred sixty-four million, two hundred forty thousand, eight hundred ninety-seven".