660432157 has 12 divisors (see below), whose sum is σ = 829634848. Its totient is φ = 514621800.

The previous prime is 660432151. The next prime is 660432161. The reversal of 660432157 is 751234066.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-660432157 is a prime.

It is a super-3 number, since 3×660432157³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660432151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 389019 + ... + 390712.

Almost surely, 2^660432157 is an apocalyptic number.

It is an amenable number.

660432157 is a deficient number, since it is larger than the sum of its proper divisors (169202691).

660432157 is a wasteful number, since it uses less digits than its factorization.

660432157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779760 (or 779749 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 660432157 is about 25698.8746251660. The cubic root of 660432157 is about 870.8487586064.

The spelling of 660432157 in words is "six hundred sixty million, four hundred thirty-two thousand, one hundred fifty-seven".