165187057 has 4 divisors (see below), whose sum is σ = 188785216. Its totient is φ = 141588900.

The previous prime is 165187051. The next prime is 165187063. The reversal of 165187057 is 750781561.

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: 750781561 = 19 ⋅39514819.

It is an interprime number because it is at equal distance from previous prime (165187051) and next prime (165187063).

It is a cyclic number.

It is not a de Polignac number, because 165187057 - 2¹⁹ = 164662769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165187051) 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, 11799069 + ... + 11799082.

It is an arithmetic number, because the mean of its divisors is an integer number (47196304).

Almost surely, 2^165187057 is an apocalyptic number.

It is an amenable number.

165187057 is a deficient number, since it is larger than the sum of its proper divisors (23598159).

165187057 is an equidigital number, since it uses as much as digits as its factorization.

165187057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23598158.

The product of its (nonzero) digits is 58800, while the sum is 40.

The square root of 165187057 is about 12852.5117000530. The cubic root of 165187057 is about 548.6878439293.

The spelling of 165187057 in words is "one hundred sixty-five million, one hundred eighty-seven thousand, fifty-seven".