18517492749 has 32 divisors (see below), whose sum is σ = 29261240320. Its totient is φ = 10195440192.

The previous prime is 18517492691. The next prime is 18517492751. The reversal of 18517492749 is 94729471581.

It is not a de Polignac number, because 18517492749 - 2⁹ = 18517492237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18517492649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35659 + ... + 195720.

It is an arithmetic number, because the mean of its divisors is an integer number (914413760).

Almost surely, 2^18517492749 is an apocalyptic number.

It is an amenable number.

18517492749 is a deficient number, since it is larger than the sum of its proper divisors (10743747571).

18517492749 is a wasteful number, since it uses less digits than its factorization.

18517492749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231529.

The product of its digits is 5080320, while the sum is 57.

The spelling of 18517492749 in words is "eighteen billion, five hundred seventeen million, four hundred ninety-two thousand, seven hundred forty-nine".