156538818 has 30 divisors (see below), whose sum is σ = 351120099. Its totient is φ = 52126524.

The previous prime is 156538813. The next prime is 156538829. The reversal of 156538818 is 818835651.

156538818 is a `hidden beast` number, since 1 + 565 + 3 + 8 + 81 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 78269409 + 78269409 = 8847^2 + 8847^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8847.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (156538813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 158755 + ... + 159737.

Almost surely, 2^156538818 is an apocalyptic number.

156538818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

156538818 is an abundant number, since it is smaller than the sum of its proper divisors (194581281).

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

156538818 is an frugal number, since it uses more digits than its factorization.

156538818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980 (or 988 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 156538818 is about 12511.5473863148. The cubic root of 156538818 is about 538.9403293196.

The spelling of 156538818 in words is "one hundred fifty-six million, five hundred thirty-eight thousand, eight hundred eighteen".