15625000049 has 2 divisors, whose sum is σ = 15625000050. Its totient is φ = 15625000048.

The previous prime is 15625000019. The next prime is 15625000087. The reversal of 15625000049 is 94000052651.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15625000000 + 49 = 125000^2 + 7^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15625000049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15624999979 and 15625000024.

It is not a weakly prime, because it can be changed into another prime (15625000019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7812500024 + 7812500025.

It is an arithmetic number, because the mean of its divisors is an integer number (7812500025).

Almost surely, 2^15625000049 is an apocalyptic number.

It is an amenable number.

15625000049 is a deficient number, since it is larger than the sum of its proper divisors (1).

15625000049 is an equidigital number, since it uses as much as digits as its factorization.

15625000049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

It can be divided in two parts, 156250000 and 49, that multiplied together give a square (7656250000 = 87500²).

The spelling of 15625000049 in words is "fifteen billion, six hundred twenty-five million, forty-nine", and thus it is an aban number.