15815252461 has 2 divisors, whose sum is σ = 15815252462. Its totient is φ = 15815252460.

The previous prime is 15815252363. The next prime is 15815252501. The reversal of 15815252461 is 16425251851.

It is an a-pointer prime, because the next prime (15815252501) can be obtained adding 15815252461 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15757780900 + 57471561 = 125530^2 + 7581^2 .

It is a cyclic number.

It is not a de Polignac number, because 15815252461 - 2⁷ = 15815252333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15815252561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7907626230 + 7907626231.

It is an arithmetic number, because the mean of its divisors is an integer number (7907626231).

Almost surely, 2^15815252461 is an apocalyptic number.

It is an amenable number.

15815252461 is a deficient number, since it is larger than the sum of its proper divisors (1).

15815252461 is an equidigital number, since it uses as much as digits as its factorization.

15815252461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96000, while the sum is 40.

The spelling of 15815252461 in words is "fifteen billion, eight hundred fifteen million, two hundred fifty-two thousand, four hundred sixty-one".