25113101561 has 4 divisors (see below), whose sum is σ = 25120221300. Its totient is φ = 25105981824.

The previous prime is 25113101527. The next prime is 25113101597. The reversal of 25113101561 is 16510131152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6063581161 + 19049520400 = 77869^2 + 138020^2 .

It is a cyclic number.

It is not a de Polignac number, because 25113101561 - 2¹⁴ = 25113085177 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 25113101561.

It is not an unprimeable number, because it can be changed into a prime (25113104561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3554576 + ... + 3561633.

It is an arithmetic number, because the mean of its divisors is an integer number (6280055325).

Almost surely, 2^25113101561 is an apocalyptic number.

It is an amenable number.

25113101561 is a deficient number, since it is larger than the sum of its proper divisors (7119739).

25113101561 is an equidigital number, since it uses as much as digits as its factorization.

25113101561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7119738.

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 25113101561 in words is "twenty-five billion, one hundred thirteen million, one hundred one thousand, five hundred sixty-one".