15625000000 has 91 divisors (see below), whose sum is σ = 38757324187. Its totient is φ = 6250000000.

The previous prime is 15624999983. The next prime is 15625000007. The reversal of 15625000000 is 52651.

It is a happy number.

The square root of 15625000000 is 125000.

The cubic root of 15625000000 is 2500.

It is a perfect power (a square, a cube, a 6-th power), and thus also a powerful number.

It can be written as a sum of positive squares in 6 ways, for example, as 8840512576 + 6784487424 = 94024^2 + 82368^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=4, B=250.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15625000007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 12 ways as a sum of consecutive naturals, for example, 3124999998 + ... + 3125000002.

Almost surely, 2^15625000000 is an apocalyptic number.

15625000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15625000000 is the 125000-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15625000000

15625000000 is an abundant number, since it is smaller than the sum of its proper divisors (23132324187).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15625000000 is an frugal number, since it uses more digits than its factorization.

15625000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

Adding to 15625000000 its reverse (52651), we get a palindrome (15625052651).

The spelling of 15625000000 in words is "fifteen billion, six hundred twenty-five million", and thus it is an aban number.