15606481561 has 4 divisors (see below), whose sum is σ = 17025252624. Its totient is φ = 14187710500.

The previous prime is 15606481547. The next prime is 15606481567. The reversal of 15606481561 is 16518460651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15606481561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15606481567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709385515 + ... + 709385536.

It is an arithmetic number, because the mean of its divisors is an integer number (4256313156).

Almost surely, 2^15606481561 is an apocalyptic number.

15606481561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15606481561 is a deficient number, since it is larger than the sum of its proper divisors (1418771063).

15606481561 is a wasteful number, since it uses less digits than its factorization.

15606481561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418771062.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 15606481561 in words is "fifteen billion, six hundred six million, four hundred eighty-one thousand, five hundred sixty-one".