18091798514 has 8 divisors (see below), whose sum is σ = 28734032988. Its totient is φ = 8513787520.

The previous prime is 18091798477. The next prime is 18091798519. The reversal of 18091798514 is 41589719081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15263367025 + 2828431489 = 123545^2 + 53183^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18091798519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266055827 + ... + 266055894.

Almost surely, 2^18091798514 is an apocalyptic number.

18091798514 is a deficient number, since it is larger than the sum of its proper divisors (10642234474).

18091798514 is a wasteful number, since it uses less digits than its factorization.

18091798514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532111740.

The product of its (nonzero) digits is 725760, while the sum is 53.

The spelling of 18091798514 in words is "eighteen billion, ninety-one million, seven hundred ninety-eight thousand, five hundred fourteen".