15487884766225 has 27 divisors (see below), whose sum is σ = 19399497403699. Its totient is φ = 12266057312000.

The previous prime is 15487884766223. The next prime is 15487884766247. The reversal of 15487884766225 is 52266748878451.

The square root of 15487884766225 is 3935465.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 1227714968529 + 14260169797696 = 1108023^2 + 3776264^2 .

It is not a de Polignac number, because 15487884766225 - 2¹ = 15487884766223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15487884766223) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1987405929 + ... + 1987413721.

Almost surely, 2^{15487884766225} is an apocalyptic number.

15487884766225 is the 3935465-th square number.

15487884766225 is the 1967733-rd centered octagonal number.

It is an amenable number.

15487884766225 is a deficient number, since it is larger than the sum of its proper divisors (3911612637474).

15487884766225 is an frugal number, since it uses more digits than its factorization.

15487884766225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15798 (or 7899 counting only the distinct ones).

The product of its digits is 1445068800, while the sum is 73.

The spelling of 15487884766225 in words is "fifteen trillion, four hundred eighty-seven billion, eight hundred eighty-four million, seven hundred sixty-six thousand, two hundred twenty-five".