664436157 has 16 divisors (see below), whose sum is σ = 1104517632. Its totient is φ = 345161520.

The previous prime is 664436107. The next prime is 664436159. The reversal of 664436157 is 751634466.

It is not a de Polignac number, because 664436157 - 2⁸ = 664435901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664436159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1437943 + ... + 1438404.

It is an arithmetic number, because the mean of its divisors is an integer number (69032352).

Almost surely, 2^664436157 is an apocalyptic number.

It is an amenable number.

664436157 is a deficient number, since it is larger than the sum of its proper divisors (440081475).

664436157 is a wasteful number, since it uses less digits than its factorization.

664436157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2876368.

The product of its digits is 362880, while the sum is 42.

The square root of 664436157 is about 25776.6591512554. The cubic root of 664436157 is about 872.6051113230.

The spelling of 664436157 in words is "six hundred sixty-four million, four hundred thirty-six thousand, one hundred fifty-seven".