664157 has 8 divisors (see below), whose sum is σ = 731136. Its totient is φ = 599472.

The previous prime is 664151. The next prime is 664177. The reversal of 664157 is 751466.

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 664157 - 2⁴ = 664141 is a prime.

It is a super-2 number, since 2×664157² = 882209041298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664151) 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, 68 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (91392).

2⁶⁶⁴¹⁵⁷ is an apocalyptic number.

It is an amenable number.

664157 is a deficient number, since it is larger than the sum of its proper divisors (66979).

664157 is a wasteful number, since it uses less digits than its factorization.

664157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147.

The product of its digits is 5040, while the sum is 29.

The square root of 664157 is about 814.9582811408. The cubic root of 664157 is about 87.2482888420.

Subtracting from 664157 its sum of digits (29), we obtain a triangular number (664128 = T₁₁₅₂).

The spelling of 664157 in words is "six hundred sixty-four thousand, one hundred fifty-seven".