15993396225 has 27 divisors (see below), whose sum is σ = 28649347779. Its totient is φ = 8528799600.

The previous prime is 15993396143. The next prime is 15993396233. The reversal of 15993396225 is 52269339951.

It is a happy number.

The square root of 15993396225 is 126465.

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

15993396225 is a `hidden beast` number, since 1 + 5 + 9 + 9 + 3 + 3 + 9 + 622 + 5 = 666.

15993396225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5757622641 + 10235773584 = 75879^2 + 101172^2 .

It is a de Polignac number, because none of the positive numbers 2^k-15993396225 is a prime.

It is an unprimeable number.

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 in 26 ways as a sum of consecutive naturals, for example, 1892760 + ... + 1901190.

Almost surely, 2^15993396225 is an apocalyptic number.

15993396225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15993396225 is the 126465-th square number.

15993396225 is the 63233-rd centered octagonal number.

It is an amenable number.

15993396225 is a deficient number, since it is larger than the sum of its proper divisors (12655951554).

15993396225 is an frugal number, since it uses more digits than its factorization.

15993396225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16878 (or 8439 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 54.

The spelling of 15993396225 in words is "fifteen billion, nine hundred ninety-three million, three hundred ninety-six thousand, two hundred twenty-five".