18249688380 has 144 divisors (see below), whose sum is σ = 64845760896. Its totient is φ = 3792136320.

The previous prime is 18249688367. The next prime is 18249688397. The reversal of 18249688380 is 8388694281.

It is a super-2 number, since 2×18249688380² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18249688380.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 249814 + ... + 314493.

It is an arithmetic number, because the mean of its divisors is an integer number (450317784).

Almost surely, 2^18249688380 is an apocalyptic number.

18249688380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18249688380 is an abundant number, since it is smaller than the sum of its proper divisors (46596072516).

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

18249688380 is a wasteful number, since it uses less digits than its factorization.

18249688380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564344 (or 564335 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 57.

The spelling of 18249688380 in words is "eighteen billion, two hundred forty-nine million, six hundred eighty-eight thousand, three hundred eighty".