15500013125 has 10 divisors (see below), whose sum is σ = 19368817182. Its totient is φ = 12400010000.

The previous prime is 15500013121. The next prime is 15500013161. The reversal of 15500013125 is 52131000551.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 4537504321 + 10962508804 = 67361^2 + 104702^2 .

It is not a de Polignac number, because 15500013125 - 2² = 15500013121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15500013125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15500013121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12399386 + ... + 12400635.

Almost surely, 2^15500013125 is an apocalyptic number.

It is an amenable number.

15500013125 is a deficient number, since it is larger than the sum of its proper divisors (3868804057).

15500013125 is an frugal number, since it uses more digits than its factorization.

15500013125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24800041 (or 24800026 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 23.

Adding to 15500013125 its reverse (52131000551), we get a palindrome (67631013676).

The spelling of 15500013125 in words is "fifteen billion, five hundred million, thirteen thousand, one hundred twenty-five".