165867156 has 144 divisors (see below), whose sum is σ = 538937280. Its totient is φ = 43727040.

The previous prime is 165867139. The next prime is 165867161. The reversal of 165867156 is 651768561.

165867156 is a `hidden beast` number, since 16 + 586 + 7 + 1 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67591 + ... + 70001.

It is an arithmetic number, because the mean of its divisors is an integer number (3742620).

Almost surely, 2^165867156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165867156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269468640).

165867156 is an abundant number, since it is smaller than the sum of its proper divisors (373070124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165867156 is a wasteful number, since it uses less digits than its factorization.

165867156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2451 (or 2436 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 165867156 is about 12878.9423478793. The cubic root of 165867156 is about 549.4398219357.

The spelling of 165867156 in words is "one hundred sixty-five million, eight hundred sixty-seven thousand, one hundred fifty-six".