16518012539 has 32 divisors (see below), whose sum is σ = 20001146880. Its totient is φ = 13325824512.

The previous prime is 16518012521. The next prime is 16518012541. The reversal of 16518012539 is 93521081561.

It is not a de Polignac number, because 16518012539 - 2²⁴ = 16501235323 is a prime.

It is a super-2 number, since 2×16518012539² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16518012496 and 16518012505.

It is not an unprimeable number, because it can be changed into a prime (16518012559) 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, 19273799 + ... + 19274655.

It is an arithmetic number, because the mean of its divisors is an integer number (625035840).

Almost surely, 2^16518012539 is an apocalyptic number.

16518012539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16518012539 is a deficient number, since it is larger than the sum of its proper divisors (3483134341).

16518012539 is a wasteful number, since it uses less digits than its factorization.

16518012539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659.

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 16518012539 in words is "sixteen billion, five hundred eighteen million, twelve thousand, five hundred thirty-nine".