15616601005509 has 48 divisors (see below), whose sum is σ = 27189931267200. Its totient is φ = 8437490229888.

The previous prime is 15616601005507. The next prime is 15616601005519. The reversal of 15616601005509 is 90550010661651.

15616601005509 is a `hidden beast` number, since 15 + 6 + 16 + 60 + 10 + 0 + 550 + 9 = 666.

15616601005509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15616601005509 - 2¹ = 15616601005507 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15616601005507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12206494 + ... + 13425039.

It is an arithmetic number, because the mean of its divisors is an integer number (566456901400).

Almost surely, 2^{15616601005509} is an apocalyptic number.

15616601005509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

15616601005509 is a deficient number, since it is larger than the sum of its proper divisors (11573330261691).

15616601005509 is a wasteful number, since it uses less digits than its factorization.

15616601005509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25632074 (or 25632071 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 15616601005509 in words is "fifteen trillion, six hundred sixteen billion, six hundred one million, five thousand, five hundred nine".