165561670 has 16 divisors (see below), whose sum is σ = 303063120. Its totient is φ = 65101984.

The previous prime is 165561661. The next prime is 165561679. The reversal of 165561670 is 76165561.

165561670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (165561661) and next prime (165561679).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165561679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139717 + ... + 140896.

It is an arithmetic number, because the mean of its divisors is an integer number (18941445).

Almost surely, 2^165561670 is an apocalyptic number.

165561670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165561670 is a deficient number, since it is larger than the sum of its proper divisors (137501450).

165561670 is a wasteful number, since it uses less digits than its factorization.

165561670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280679.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 165561670 is about 12867.0769796407. The cubic root of 165561670 is about 549.1023041963.

The spelling of 165561670 in words is "one hundred sixty-five million, five hundred sixty-one thousand, six hundred seventy".