25113104561 has 2 divisors, whose sum is σ = 25113104562. Its totient is φ = 25113104560.

The previous prime is 25113104551. The next prime is 25113104573. The reversal of 25113104561 is 16540131152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14280250000 + 10832854561 = 119500^2 + 104081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25113104561 is a prime.

It is not a weakly prime, because it can be changed into another prime (25113104551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12556552280 + 12556552281.

It is an arithmetic number, because the mean of its divisors is an integer number (12556552281).

Almost surely, 2^25113104561 is an apocalyptic number.

It is an amenable number.

25113104561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25113104561 is an equidigital number, since it uses as much as digits as its factorization.

25113104561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 25113104561 in words is "twenty-five billion, one hundred thirteen million, one hundred four thousand, five hundred sixty-one".