15445440561 has 4 divisors (see below), whose sum is σ = 20593920752. Its totient is φ = 10296960372.

The previous prime is 15445440557. The next prime is 15445440581. The reversal of 15445440561 is 16504454451.

15445440561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 15445440561 - 2² = 15445440557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15445440541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2574240091 + ... + 2574240096.

It is an arithmetic number, because the mean of its divisors is an integer number (5148480188).

Almost surely, 2^15445440561 is an apocalyptic number.

It is an amenable number.

15445440561 is a deficient number, since it is larger than the sum of its proper divisors (5148480191).

15445440561 is an equidigital number, since it uses as much as digits as its factorization.

15445440561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5148480190.

The product of its (nonzero) digits is 192000, while the sum is 39.

The spelling of 15445440561 in words is "fifteen billion, four hundred forty-five million, four hundred forty thousand, five hundred sixty-one".