18611987952 has 80 divisors (see below), whose sum is σ = 50677604640. Its totient is φ = 5877021696.

The previous prime is 18611987951. The next prime is 18611987963. The reversal of 18611987952 is 25978911681.

It is a junction number, because it is equal to n+sod(n) for n = 18611987892 and 18611987901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18611987951) 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 15 ways as a sum of consecutive naturals, for example, 52363 + ... + 199914.

It is an arithmetic number, because the mean of its divisors is an integer number (633470058).

Almost surely, 2^18611987952 is an apocalyptic number.

18611987952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18611987952 is an abundant number, since it is smaller than the sum of its proper divisors (32065616688).

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

18611987952 is a wasteful number, since it uses less digits than its factorization.

18611987952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252370 (or 252364 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 57.

The spelling of 18611987952 in words is "eighteen billion, six hundred eleven million, nine hundred eighty-seven thousand, nine hundred fifty-two".