18003149793 has 6 divisors (see below), whose sum is σ = 26004549714. Its totient is φ = 12002099856.

The previous prime is 18003149771. The next prime is 18003149807. The reversal of 18003149793 is 39794130081.

It can be written as a sum of positive squares in only one way, i.e., 14704715169 + 3298434624 = 121263^2 + 57432^2 .

It is not a de Polignac number, because 18003149793 - 2⁵ = 18003149761 is a prime.

It is a super-2 number, since 2×18003149793² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18003149093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1000174980 + ... + 1000174997.

It is an arithmetic number, because the mean of its divisors is an integer number (4334091619).

Almost surely, 2^18003149793 is an apocalyptic number.

It is an amenable number.

18003149793 is a deficient number, since it is larger than the sum of its proper divisors (8001399921).

18003149793 is a wasteful number, since it uses less digits than its factorization.

18003149793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000349983 (or 2000349980 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 18003149793 in words is "eighteen billion, three million, one hundred forty-nine thousand, seven hundred ninety-three".