25871749901 has 4 divisors (see below), whose sum is σ = 25953364572. Its totient is φ = 25790135232.

The previous prime is 25871749889. The next prime is 25871749919. The reversal of 25871749901 is 10994717852.

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 5608512100 + 20263237801 = 74890^2 + 142349^2 .

It is a cyclic number.

It is not a de Polignac number, because 25871749901 - 2⁶ = 25871749837 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 (25871749201) 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, 40806860 + ... + 40807493.

It is an arithmetic number, because the mean of its divisors is an integer number (6488341143).

Almost surely, 2^25871749901 is an apocalyptic number.

It is an amenable number.

25871749901 is a deficient number, since it is larger than the sum of its proper divisors (81614671).

25871749901 is an equidigital number, since it uses as much as digits as its factorization.

25871749901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81614670.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 25871749901 in words is "twenty-five billion, eight hundred seventy-one million, seven hundred forty-nine thousand, nine hundred one".