15218923225 has 27 divisors (see below), whose sum is σ = 20752267039. Its totient is φ = 11063373200.

The previous prime is 15218923157. The next prime is 15218923231. The reversal of 15218923225 is 52232981251.

The square root of 15218923225 is 123365.

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

It can be written as a sum of positive squares in only one way, i.e., 5478812361 + 9740110864 = 74019^2 + 98692^2 .

It is not a de Polignac number, because 15218923225 - 2⁹ = 15218922713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6783954 + ... + 6786196.

Almost surely, 2^15218923225 is an apocalyptic number.

15218923225 is the 123365-th square number.

15218923225 is the 61683-rd centered octagonal number.

It is an amenable number.

15218923225 is a deficient number, since it is larger than the sum of its proper divisors (5533343814).

15218923225 is an frugal number, since it uses more digits than its factorization.

15218923225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4518 (or 2259 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The spelling of 15218923225 in words is "fifteen billion, two hundred eighteen million, nine hundred twenty-three thousand, two hundred twenty-five".