8561385615 has 16 divisors (see below), whose sum is σ = 13885865568. Its totient is φ = 4503522816.

The previous prime is 8561385587. The next prime is 8561385641. The reversal of 8561385615 is 5165831658.

8561385615 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8561385615 - 2⁸ = 8561385359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3908214 + ... + 3910403.

It is an arithmetic number, because the mean of its divisors is an integer number (867866598).

Almost surely, 2^8561385615 is an apocalyptic number.

8561385615 is a deficient number, since it is larger than the sum of its proper divisors (5324479953).

8561385615 is a wasteful number, since it uses less digits than its factorization.

8561385615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7818698.

The product of its digits is 864000, while the sum is 48.

The square root of 8561385615 is about 92527.7559168059. The cubic root of 8561385615 is about 2045.7286129474.

The spelling of 8561385615 in words is "eight billion, five hundred sixty-one million, three hundred eighty-five thousand, six hundred fifteen".