15606561501 has 12 divisors (see below), whose sum is σ = 22571106012. Its totient is φ = 10391315136.

The previous prime is 15606561457. The next prime is 15606561517. The reversal of 15606561501 is 10516560651.

It can be written as a sum of positive squares in 2 ways, for example, as 10547084601 + 5059476900 = 102699^2 + 71130^2 .

It is not a de Polignac number, because 15606561501 - 2³³ = 7016626909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15606561521) 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 11 ways as a sum of consecutive naturals, for example, 1080696 + ... + 1095041.

It is an arithmetic number, because the mean of its divisors is an integer number (1880925501).

Almost surely, 2^15606561501 is an apocalyptic number.

It is an amenable number.

15606561501 is a deficient number, since it is larger than the sum of its proper divisors (6964544511).

15606561501 is a wasteful number, since it uses less digits than its factorization.

15606561501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176540 (or 2176537 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 15606561501 in words is "fifteen billion, six hundred six million, five hundred sixty-one thousand, five hundred one".