15606561500 has 48 divisors (see below), whose sum is σ = 34809989760. Its totient is φ = 6109793600.

The previous prime is 15606561457. The next prime is 15606561517. The reversal of 15606561500 is 516560651.

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, 308555 + ... + 355554.

It is an arithmetic number, because the mean of its divisors is an integer number (725208120).

Almost surely, 2^15606561500 is an apocalyptic number.

15606561500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15606561500 is an abundant number, since it is smaller than the sum of its proper divisors (19203428260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15606561500 is a wasteful number, since it uses less digits than its factorization.

15606561500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664175 (or 664163 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 15606561500 in words is "fifteen billion, six hundred six million, five hundred sixty-one thousand, five hundred".