15540455225 has 24 divisors (see below), whose sum is σ = 20462362200. Its totient is φ = 11667409920.

The previous prime is 15540455197. The next prime is 15540455239. The reversal of 15540455225 is 52255404551.

15540455225 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 12 ways, for example, as 10061584 + 15530393641 = 3172^2 + 124621^2 .

It is a de Polignac number, because none of the positive numbers 2^k-15540455225 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 23 ways as a sum of consecutive naturals, for example, 95939 + ... + 200711.

It is an arithmetic number, because the mean of its divisors is an integer number (852598425).

Almost surely, 2^15540455225 is an apocalyptic number.

It is an amenable number.

15540455225 is a deficient number, since it is larger than the sum of its proper divisors (4921906975).

15540455225 is a wasteful number, since it uses less digits than its factorization.

15540455225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105149 (or 105144 counting only the distinct ones).

The product of its (nonzero) digits is 200000, while the sum is 38.

Adding to 15540455225 its reverse (52255404551), we get a palindrome (67795859776).

The spelling of 15540455225 in words is "fifteen billion, five hundred forty million, four hundred fifty-five thousand, two hundred twenty-five".