12611557539 has 48 divisors (see below), whose sum is σ = 20988364800. Its totient is φ = 7148243520.

The previous prime is 12611557531. The next prime is 12611557571. The reversal of 12611557539 is 93575511621.

12611557539 is a `hidden beast` number, since 1 + 2 + 61 + 1 + 5 + 57 + 539 = 666.

It is not a de Polignac number, because 12611557539 - 2³ = 12611557531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12611557494 and 12611557503.

It is not an unprimeable number, because it can be changed into a prime (12611557531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4599709 + ... + 4602449.

It is an arithmetic number, because the mean of its divisors is an integer number (437257600).

Almost surely, 2^12611557539 is an apocalyptic number.

12611557539 is a deficient number, since it is larger than the sum of its proper divisors (8376807261).

12611557539 is a wasteful number, since it uses less digits than its factorization.

12611557539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320 (or 3317 counting only the distinct ones).

The product of its digits is 283500, while the sum is 45.

The spelling of 12611557539 in words is "twelve billion, six hundred eleven million, five hundred fifty-seven thousand, five hundred thirty-nine".