165867612156 has 144 divisors (see below), whose sum is σ = 453244864800. Its totient is φ = 50973235200.

The previous prime is 165867612149. The next prime is 165867612173. The reversal of 165867612156 is 651216768561.

165867612156 is a `hidden beast` number, since 1 + 6 + 5 + 8 + 6 + 7 + 612 + 15 + 6 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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, 11462766 + ... + 11477226.

Almost surely, 2^165867612156 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 165867612156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226622432400).

165867612156 is an abundant number, since it is smaller than the sum of its proper divisors (287377252644).

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

165867612156 is a wasteful number, since it uses less digits than its factorization.

165867612156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14940 (or 14935 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 165867612156 in words is "one hundred sixty-five billion, eight hundred sixty-seven million, six hundred twelve thousand, one hundred fifty-six".