25374613261 has 4 divisors (see below), whose sum is σ = 25401240252. Its totient is φ = 25347986272.

The previous prime is 25374613207. The next prime is 25374613301. The reversal of 25374613261 is 16231647352.

It is a happy number.

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 17183277225 + 8191336036 = 131085^2 + 90506^2 .

It is a cyclic number.

It is not a de Polignac number, because 25374613261 - 2¹⁵ = 25374580493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25374613961) 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, 13312066 + ... + 13313971.

It is an arithmetic number, because the mean of its divisors is an integer number (6350310063).

Almost surely, 2^25374613261 is an apocalyptic number.

It is an amenable number.

25374613261 is a deficient number, since it is larger than the sum of its proper divisors (26626991).

25374613261 is an equidigital number, since it uses as much as digits as its factorization.

25374613261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26626990.

The product of its digits is 181440, while the sum is 40.

The spelling of 25374613261 in words is "twenty-five billion, three hundred seventy-four million, six hundred thirteen thousand, two hundred sixty-one".