15947901225 has 27 divisors (see below), whose sum is σ = 28567856343. Its totient is φ = 8504537040.

The previous prime is 15947901163. The next prime is 15947901247. The reversal of 15947901225 is 52210974951.

The square root of 15947901225 is 126285.

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

15947901225 is a `hidden beast` number, since 1 + 59 + 479 + 0 + 122 + 5 = 666.

15947901225 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., 5741244441 + 10206656784 = 75771^2 + 101028^2 .

It is not a de Polignac number, because 15947901225 - 2¹³ = 15947893033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 1890066 + ... + 1898484.

Almost surely, 2^15947901225 is an apocalyptic number.

15947901225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15947901225 is the 126285-th square number.

15947901225 is the 63143-rd centered octagonal number.

It is an amenable number.

15947901225 is a deficient number, since it is larger than the sum of its proper divisors (12619955118).

15947901225 is an frugal number, since it uses more digits than its factorization.

15947901225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16854 (or 8427 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 15947901225 in words is "fifteen billion, nine hundred forty-seven million, nine hundred one thousand, two hundred twenty-five".