18516497380 has 12 divisors (see below), whose sum is σ = 38884644540. Its totient is φ = 7406598944.

The previous prime is 18516497353. The next prime is 18516497381. The reversal of 18516497380 is 8379461581.

It can be written as a sum of positive squares in 2 ways, for example, as 6220792384 + 12295704996 = 78872^2 + 110886^2 .

It is not an unprimeable number, because it can be changed into a prime (18516497381) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 462912415 + ... + 462912454.

It is an arithmetic number, because the mean of its divisors is an integer number (3240387045).

Almost surely, 2^18516497380 is an apocalyptic number.

18516497380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18516497380 is an abundant number, since it is smaller than the sum of its proper divisors (20368147160).

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

18516497380 is a wasteful number, since it uses less digits than its factorization.

18516497380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925824878 (or 925824876 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 18516497380 in words is "eighteen billion, five hundred sixteen million, four hundred ninety-seven thousand, three hundred eighty".