18877111236 has 135 divisors (see below), whose sum is σ = 52539119479. Its totient is φ = 5909041152.

The previous prime is 18877111207. The next prime is 18877111237. The reversal of 18877111236 is 63211177881.

The square root of 18877111236 is 137394.

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 2964802500 + 15912308736 = 54450^2 + 126144^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18877111191 and 18877111200.

It is not an unprimeable number, because it can be changed into a prime (18877111237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 42042340 + ... + 42042788.

Almost surely, 2^18877111236 is an apocalyptic number.

18877111236 is the 137394-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18877111236

18877111236 is an abundant number, since it is smaller than the sum of its proper divisors (33662008243).

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

18877111236 is an equidigital number, since it uses as much as digits as its factorization.

18877111236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948 (or 471 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The spelling of 18877111236 in words is "eighteen billion, eight hundred seventy-seven million, one hundred eleven thousand, two hundred thirty-six".