15624756481 has 2 divisors, whose sum is σ = 15624756482. Its totient is φ = 15624756480.

The previous prime is 15624756473. The next prime is 15624756509. The reversal of 15624756481 is 18465742651.

15624756481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14699380081 + 925376400 = 121241^2 + 30420^2 .

It is a cyclic number.

It is not a de Polignac number, because 15624756481 - 2³ = 15624756473 is a prime.

It is a super-2 number, since 2×15624756481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15624756421) 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, 7812378240 + 7812378241.

It is an arithmetic number, because the mean of its divisors is an integer number (7812378241).

Almost surely, 2^15624756481 is an apocalyptic number.

It is an amenable number.

15624756481 is a deficient number, since it is larger than the sum of its proper divisors (1).

15624756481 is an equidigital number, since it uses as much as digits as its factorization.

15624756481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 49.

The spelling of 15624756481 in words is "fifteen billion, six hundred twenty-four million, seven hundred fifty-six thousand, four hundred eighty-one".