664231857 has 8 divisors (see below), whose sum is σ = 907243680. Its totient is φ = 432020640.

The previous prime is 664231829. The next prime is 664231861. The reversal of 664231857 is 758132466.

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

It is not a de Polignac number, because 664231857 - 2¹⁴ = 664215473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664231817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2700007 + ... + 2700252.

It is an arithmetic number, because the mean of its divisors is an integer number (113405460).

Almost surely, 2^664231857 is an apocalyptic number.

It is an amenable number.

664231857 is a deficient number, since it is larger than the sum of its proper divisors (243011823).

664231857 is a wasteful number, since it uses less digits than its factorization.

664231857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5400303.

The product of its digits is 241920, while the sum is 42.

The square root of 664231857 is about 25772.6959590959. The cubic root of 664231857 is about 872.5156663115.

The spelling of 664231857 in words is "six hundred sixty-four million, two hundred thirty-one thousand, eight hundred fifty-seven".