18010039509 has 24 divisors (see below), whose sum is σ = 32433665472. Its totient is φ = 9355864320.

The previous prime is 18010039493. The next prime is 18010039511. The reversal of 18010039509 is 90593001081.

It is a happy number.

18010039509 is a `hidden beast` number, since 18 + 0 + 100 + 39 + 509 = 666.

It is not a de Polignac number, because 18010039509 - 2⁴ = 18010039493 is a prime.

It is a super-2 number, since 2×18010039509² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18010039529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12993564 + ... + 12994949.

It is an arithmetic number, because the mean of its divisors is an integer number (1351402728).

Almost surely, 2^18010039509 is an apocalyptic number.

It is an amenable number.

18010039509 is a deficient number, since it is larger than the sum of its proper divisors (14423625963).

18010039509 is a wasteful number, since it uses less digits than its factorization.

18010039509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25988537 (or 25988534 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 18010039509 in words is "eighteen billion, ten million, thirty-nine thousand, five hundred nine".