165541570 has 32 divisors (see below), whose sum is σ = 311137200. Its totient is φ = 63334656.

The previous prime is 165541553. The next prime is 165541573. The reversal of 165541570 is 75145561.

It can be written as a sum of positive squares in 8 ways, for example, as 121066009 + 44475561 = 11003^2 + 6669^2 .

It is a super-2 number, since 2×165541570² = 54808022796129800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165541573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28992 + ... + 34228.

Almost surely, 2^165541570 is an apocalyptic number.

165541570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165541570 is a deficient number, since it is larger than the sum of its proper divisors (145595630).

165541570 is a wasteful number, since it uses less digits than its factorization.

165541570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 165541570 is about 12866.2958927579. The cubic root of 165541570 is about 549.0800820580.

The spelling of 165541570 in words is "one hundred sixty-five million, five hundred forty-one thousand, five hundred seventy".