18684156100 has 27 divisors (see below), whose sum is σ = 40547585127. Its totient is φ = 7473115680.

The previous prime is 18684156059. The next prime is 18684156109. The reversal of 18684156100 is 165148681.

The square root of 18684156100 is 136690.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 288116676 + 18396039424 = 16974^2 + 135632^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18684156109) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1360066 + ... + 1373734.

Almost surely, 2^18684156100 is an apocalyptic number.

18684156100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18684156100 is the 136690-th square number.

It is an amenable number.

18684156100 is an abundant number, since it is smaller than the sum of its proper divisors (21863429027).

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

18684156100 is an frugal number, since it uses more digits than its factorization.

18684156100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27352 (or 13676 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The spelling of 18684156100 in words is "eighteen billion, six hundred eighty-four million, one hundred fifty-six thousand, one hundred".