15561716089 has 4 divisors (see below), whose sum is σ = 15774890356. Its totient is φ = 15348541824.

The previous prime is 15561716081. The next prime is 15561716117. The reversal of 15561716089 is 98061716551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8485541689 + 7076174400 = 92117^2 + 84120^2 .

It is a cyclic number.

It is not a de Polignac number, because 15561716089 - 2³ = 15561716081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15561716081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106587024 + ... + 106587169.

It is an arithmetic number, because the mean of its divisors is an integer number (3943722589).

Almost surely, 2^15561716089 is an apocalyptic number.

It is an amenable number.

15561716089 is a deficient number, since it is larger than the sum of its proper divisors (213174267).

15561716089 is an equidigital number, since it uses as much as digits as its factorization.

15561716089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213174266.

The product of its (nonzero) digits is 453600, while the sum is 49.

The spelling of 15561716089 in words is "fifteen billion, five hundred sixty-one million, seven hundred sixteen thousand, eighty-nine".