18681969124 has 81 divisors (see below), whose sum is σ = 41236569801. Its totient is φ = 7380828000.

The previous prime is 18681969083. The next prime is 18681969139. The reversal of 18681969124 is 42196918681.

The square root of 18681969124 is 136682.

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

It can be written as a sum of positive squares in only one way, i.e., 2763604900 + 15918364224 = 52570^2 + 126168^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 24875749 + ... + 24876499.

Almost surely, 2^18681969124 is an apocalyptic number.

18681969124 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18681969124 is the 136682-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18681969124

18681969124 is an abundant number, since it is smaller than the sum of its proper divisors (22554600677).

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

18681969124 is an equidigital number, since it uses as much as digits as its factorization.

18681969124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546 (or 773 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 55.

The spelling of 18681969124 in words is "eighteen billion, six hundred eighty-one million, nine hundred sixty-nine thousand, one hundred twenty-four".