15725015261 has 2 divisors, whose sum is σ = 15725015262. Its totient is φ = 15725015260.

The previous prime is 15725015227. The next prime is 15725015287. The reversal of 15725015261 is 16251052751.

15725015261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14905968100 + 819047161 = 122090^2 + 28619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15725015261 is a prime.

It is a super-2 number, since 2×15725015261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15775015261) 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 as a sum of consecutive naturals, namely, 7862507630 + 7862507631.

It is an arithmetic number, because the mean of its divisors is an integer number (7862507631).

Almost surely, 2^15725015261 is an apocalyptic number.

It is an amenable number.

15725015261 is a deficient number, since it is larger than the sum of its proper divisors (1).

15725015261 is an equidigital number, since it uses as much as digits as its factorization.

15725015261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 15725015261 in words is "fifteen billion, seven hundred twenty-five million, fifteen thousand, two hundred sixty-one".