660136157 has 4 divisors (see below), whose sum is σ = 662095356. Its totient is φ = 658176960.

The previous prime is 660136123. The next prime is 660136199. The reversal of 660136157 is 751631066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 448550041 + 211586116 = 21179^2 + 14546^2 .

It is a cyclic number.

It is not a de Polignac number, because 660136157 - 2⁸ = 660135901 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 (660136357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979094 + ... + 979767.

It is an arithmetic number, because the mean of its divisors is an integer number (165523839).

Almost surely, 2^660136157 is an apocalyptic number.

It is an amenable number.

660136157 is a deficient number, since it is larger than the sum of its proper divisors (1959199).

660136157 is a wasteful number, since it uses less digits than its factorization.

660136157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959198.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 660136157 is about 25693.1149726926. The cubic root of 660136157 is about 870.7186368623.

The spelling of 660136157 in words is "six hundred sixty million, one hundred thirty-six thousand, one hundred fifty-seven".