15725015281 has 16 divisors (see below), whose sum is σ = 16325236240. Its totient is φ = 15134895360.

The previous prime is 15725015261. The next prime is 15725015287. The reversal of 15725015281 is 18251052751.

It can be written as a sum of positive squares in 8 ways, for example, as 493506225 + 15231509056 = 22215^2 + 123416^2 .

It is a cyclic number.

It is not a de Polignac number, because 15725015281 - 2¹⁵ = 15724982513 is a prime.

It is a super-2 number, since 2×15725015281² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15725015281.

It is not an unprimeable number, because it can be changed into a prime (15725015287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1324351 + ... + 1336171.

It is an arithmetic number, because the mean of its divisors is an integer number (1020327265).

Almost surely, 2^15725015281 is an apocalyptic number.

It is an amenable number.

15725015281 is a deficient number, since it is larger than the sum of its proper divisors (600220959).

15725015281 is a wasteful number, since it uses less digits than its factorization.

15725015281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12244.

The product of its (nonzero) digits is 28000, while the sum is 37.

The spelling of 15725015281 in words is "fifteen billion, seven hundred twenty-five million, fifteen thousand, two hundred eighty-one".