18499397513 has 4 divisors (see below), whose sum is σ = 19303719168. Its totient is φ = 17695075860.

The previous prime is 18499397509. The next prime is 18499397551. The reversal of 18499397513 is 31579399481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18499397513 - 2² = 18499397509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18499391513) 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 3 ways as a sum of consecutive naturals, for example, 402160793 + ... + 402160838.

It is an arithmetic number, because the mean of its divisors is an integer number (4825929792).

Almost surely, 2^18499397513 is an apocalyptic number.

It is an amenable number.

18499397513 is a deficient number, since it is larger than the sum of its proper divisors (804321655).

18499397513 is an equidigital number, since it uses as much as digits as its factorization.

18499397513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804321654.

The product of its digits is 7348320, while the sum is 59.

The spelling of 18499397513 in words is "eighteen billion, four hundred ninety-nine million, three hundred ninety-seven thousand, five hundred thirteen".