25706811149 has 4 divisors (see below), whose sum is σ = 25707432960. Its totient is φ = 25706189340.

The previous prime is 25706811139. The next prime is 25706811187. The reversal of 25706811149 is 94111860752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25706811149 - 2⁴ = 25706811133 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 (25706811139) 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, 244109 + ... + 333170.

It is an arithmetic number, because the mean of its divisors is an integer number (6426858240).

Almost surely, 2^25706811149 is an apocalyptic number.

It is an amenable number.

25706811149 is a deficient number, since it is larger than the sum of its proper divisors (621811).

25706811149 is an equidigital number, since it uses as much as digits as its factorization.

25706811149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621810.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 25706811149 in words is "twenty-five billion, seven hundred six million, eight hundred eleven thousand, one hundred forty-nine".