664725157 has 8 divisors (see below), whose sum is σ = 696411392. Its totient is φ = 633679200.

The previous prime is 664725121. The next prime is 664725161. The reversal of 664725157 is 751527466.

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

It is a cyclic number.

It is not a de Polignac number, because 664725157 - 2⁷ = 664725029 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 (664725167) 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, 157944 + ... + 162097.

It is an arithmetic number, because the mean of its divisors is an integer number (87051424).

Almost surely, 2^664725157 is an apocalyptic number.

664725157 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

664725157 is a deficient number, since it is larger than the sum of its proper divisors (31686235).

664725157 is a wasteful number, since it uses less digits than its factorization.

664725157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320139.

The product of its digits is 352800, while the sum is 43.

The square root of 664725157 is about 25782.2643885288. The cubic root of 664725157 is about 872.7316077117.

The spelling of 664725157 in words is "six hundred sixty-four million, seven hundred twenty-five thousand, one hundred fifty-seven".