15001565560561 has 8 divisors (see below), whose sum is σ = 15409180803240. Its totient is φ = 14594064398208.

The previous prime is 15001565560547. The next prime is 15001565560571. The reversal of 15001565560561 is 16506556510051.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4755260590336 + 10246304970225 = 2180656^2 + 3200985^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15001565560561 - 2³⁷ = 14864126607089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15001565560511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28253476 + ... + 28779541.

It is an arithmetic number, because the mean of its divisors is an integer number (1926147600405).

Almost surely, 2^{15001565560561} is an apocalyptic number.

It is an amenable number.

15001565560561 is a deficient number, since it is larger than the sum of its proper divisors (407615242679).

15001565560561 is an equidigital number, since it uses as much as digits as its factorization.

15001565560561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57040163.

The product of its (nonzero) digits is 675000, while the sum is 46.

The spelling of 15001565560561 in words is "fifteen trillion, one billion, five hundred sixty-five million, five hundred sixty thousand, five hundred sixty-one".