18513219440 has 40 divisors (see below), whose sum is σ = 43071634608. Its totient is φ = 7400401920.

The previous prime is 18513219407. The next prime is 18513219451. The reversal of 18513219440 is 4491231581.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 18513219394 and 18513219403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46904 + ... + 198056.

Almost surely, 2^18513219440 is an apocalyptic number.

18513219440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18513219440 is an abundant number, since it is smaller than the sum of its proper divisors (24558415168).

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

18513219440 is a wasteful number, since it uses less digits than its factorization.

18513219440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152697 (or 152691 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 18513219440 in words is "eighteen billion, five hundred thirteen million, two hundred nineteen thousand, four hundred forty".