157330661 has 4 divisors (see below), whose sum is σ = 157735500. Its totient is φ = 156925824.

The previous prime is 157330637. The next prime is 157330669. The reversal of 157330661 is 166033751.

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 20884900 + 136445761 = 4570^2 + 11681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157330661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157330669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201836 + ... + 202613.

It is an arithmetic number, because the mean of its divisors is an integer number (39433875).

Almost surely, 2^157330661 is an apocalyptic number.

It is an amenable number.

157330661 is a deficient number, since it is larger than the sum of its proper divisors (404839).

157330661 is an equidigital number, since it uses as much as digits as its factorization.

157330661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404838.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 157330661 is about 12543.1519563465. The cubic root of 157330661 is about 539.8475346886.

The spelling of 157330661 in words is "one hundred fifty-seven million, three hundred thirty thousand, six hundred sixty-one".