15561252615 has 32 divisors (see below), whose sum is σ = 25858319040. Its totient is φ = 7984272384.

The previous prime is 15561252571. The next prime is 15561252647. The reversal of 15561252615 is 51625216551.

It is not a de Polignac number, because 15561252615 - 2¹¹ = 15561250567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108124 + ... + 206913.

It is an arithmetic number, because the mean of its divisors is an integer number (808072470).

Almost surely, 2^15561252615 is an apocalyptic number.

15561252615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15561252615 is a deficient number, since it is larger than the sum of its proper divisors (10297066425).

15561252615 is a wasteful number, since it uses less digits than its factorization.

15561252615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315171.

The product of its digits is 90000, while the sum is 39.

The spelling of 15561252615 in words is "fifteen billion, five hundred sixty-one million, two hundred fifty-two thousand, six hundred fifteen".