15725462821 has 2 divisors, whose sum is σ = 15725462822. Its totient is φ = 15725462820.

The previous prime is 15725462801. The next prime is 15725462843. The reversal of 15725462821 is 12826452751.

15725462821 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., 15150901921 + 574560900 = 123089^2 + 23970^2 .

It is a cyclic number.

It is not a de Polignac number, because 15725462821 - 2¹³ = 15725454629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15725462801) 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, 7862731410 + 7862731411.

It is an arithmetic number, because the mean of its divisors is an integer number (7862731411).

Almost surely, 2^15725462821 is an apocalyptic number.

It is an amenable number.

15725462821 is a deficient number, since it is larger than the sum of its proper divisors (1).

15725462821 is an equidigital number, since it uses as much as digits as its factorization.

15725462821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 268800, while the sum is 43.

The spelling of 15725462821 in words is "fifteen billion, seven hundred twenty-five million, four hundred sixty-two thousand, eight hundred twenty-one".