664672158 has 24 divisors (see below), whose sum is σ = 1442374128. Its totient is φ = 221211072.

The previous prime is 664672157. The next prime is 664672159. The reversal of 664672158 is 851276466.

It is an interprime number because it is at equal distance from previous prime (664672157) and next prime (664672159).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664672157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16891 + ... + 40182.

It is an arithmetic number, because the mean of its divisors is an integer number (60098922).

Almost surely, 2^664672158 is an apocalyptic number.

664672158 is an abundant number, since it is smaller than the sum of its proper divisors (777701970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664672158 is a wasteful number, since it uses less digits than its factorization.

664672158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57728 (or 57725 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 664672158 is about 25781.2365490874. The cubic root of 664672158 is about 872.7084125955.

The spelling of 664672158 in words is "six hundred sixty-four million, six hundred seventy-two thousand, one hundred fifty-eight".