165501157 has 4 divisors (see below), whose sum is σ = 170839936. Its totient is φ = 160162380.

The previous prime is 165501143. The next prime is 165501163. The reversal of 165501157 is 751105561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 751105561 = 103 ⋅7292287.

It is a cyclic number.

It is not a de Polignac number, because 165501157 - 2⁷ = 165501029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 5338747 = 165501157 / (1 + 6 + 5 + 5 + 0 + 1 + 1 + 5 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165501257) 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, 2669343 + ... + 2669404.

It is an arithmetic number, because the mean of its divisors is an integer number (42709984).

Almost surely, 2^165501157 is an apocalyptic number.

It is an amenable number.

165501157 is a deficient number, since it is larger than the sum of its proper divisors (5338779).

165501157 is an equidigital number, since it uses as much as digits as its factorization.

165501157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5338778.

The product of its (nonzero) digits is 5250, while the sum is 31.

The square root of 165501157 is about 12864.7252982720. The cubic root of 165501157 is about 549.0353968482.

The spelling of 165501157 in words is "one hundred sixty-five million, five hundred one thousand, one hundred fifty-seven".