165570087 has 4 divisors (see below), whose sum is σ = 220760120. Its totient is φ = 110380056.

The previous prime is 165570073. The next prime is 165570103. The reversal of 165570087 is 780075561.

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

It is not a de Polignac number, because 165570087 - 2⁴ = 165570071 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 (165500087) 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, 27595012 + ... + 27595017.

It is an arithmetic number, because the mean of its divisors is an integer number (55190030).

Almost surely, 2^165570087 is an apocalyptic number.

165570087 is a deficient number, since it is larger than the sum of its proper divisors (55190033).

165570087 is an equidigital number, since it uses as much as digits as its factorization.

165570087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55190032.

The product of its (nonzero) digits is 58800, while the sum is 39.

The square root of 165570087 is about 12867.4040505457. The cubic root of 165570087 is about 549.1116093206. Note that the first 3 decimals are identical.

The spelling of 165570087 in words is "one hundred sixty-five million, five hundred seventy thousand, eighty-seven".