16187236864 has 40 divisors (see below), whose sum is σ = 32395909788. Its totient is φ = 8080343040.

The previous prime is 16187236859. The next prime is 16187236913. The reversal of 16187236864 is 46863278161.

It can be written as a sum of positive squares in 2 ways, for example, as 14258270464 + 1928966400 = 119408^2 + 43920^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 290284 + ... + 341524.

Almost surely, 2^16187236864 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 16187236864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16197954894).

16187236864 is an abundant number, since it is smaller than the sum of its proper divisors (16208672924).

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

16187236864 is an frugal number, since it uses more digits than its factorization.

16187236864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51876 (or 51860 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The spelling of 16187236864 in words is "sixteen billion, one hundred eighty-seven million, two hundred thirty-six thousand, eight hundred sixty-four".