15265281940561 has 3 divisors (see below), whose sum is σ = 15265285847643. Its totient is φ = 15265278033480.

The previous prime is 15265281940537. The next prime is 15265281940589. The reversal of 15265281940561 is 16504918256251.

It is a happy number.

The square root of 15265281940561 is 3907081.

It is a perfect power (a square), and thus also a powerful number.

15265281940561 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3113922566161 + 12151359374400 = 1764631^2 + 3485880^2 .

It is not a de Polignac number, because 15265281940561 - 2²¹ = 15265279843409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15265281941561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1953541 + ... + 5860621.

It is an arithmetic number, because the mean of its divisors is an integer number (5088428615881).

Almost surely, 2^{15265281940561} is an apocalyptic number.

15265281940561 is the 3907081-st square number.

15265281940561 is the 1953541-st centered octagonal number.

It is an amenable number.

15265281940561 is a deficient number, since it is larger than the sum of its proper divisors (3907082).

15265281940561 is an frugal number, since it uses more digits than its factorization.

15265281940561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7814162 (or 3907081 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 55.

The spelling of 15265281940561 in words is "fifteen trillion, two hundred sixty-five billion, two hundred eighty-one million, nine hundred forty thousand, five hundred sixty-one".