15625000001 has 32 divisors (see below), whose sum is σ = 17637266976. Its totient is φ = 13747968000.

The previous prime is 15624999983. The next prime is 15625000007. The reversal of 15625000001 is 10000052651.

It is a Cunningham number, because it is equal to 50⁶+1.

It can be written as a sum of positive squares in 16 ways, for example, as 10988070976 + 4636929025 = 104824^2 + 68095^2 .

It is not a de Polignac number, because 15625000001 - 2²⁶ = 15557891137 is a prime.

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 polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5103011 + ... + 5106071.

It is an arithmetic number, because the mean of its divisors is an integer number (551164593).

Almost surely, 2^15625000001 is an apocalyptic number.

It is an amenable number.

15625000001 is a deficient number, since it is larger than the sum of its proper divisors (2012266975).

15625000001 is a wasteful number, since it uses less digits than its factorization.

15625000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333.

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 15625000001 its reverse (10000052651), we get a palindrome (25625052652).

The spelling of 15625000001 in words is "fifteen billion, six hundred twenty-five million, one", and thus it is an aban number.