25856243801 has 4 divisors (see below), whose sum is σ = 25856895204. Its totient is φ = 25855592400.

The previous prime is 25856243723. The next prime is 25856243827. The reversal of 25856243801 is 10834265852.

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 24592512400 + 1263731401 = 156820^2 + 35549^2 .

It is a cyclic number.

It is not a de Polignac number, because 25856243801 - 2¹⁴ = 25856227417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25856243851) 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, 262010 + ... + 346931.

It is an arithmetic number, because the mean of its divisors is an integer number (6464223801).

Almost surely, 2^25856243801 is an apocalyptic number.

It is an amenable number.

25856243801 is a deficient number, since it is larger than the sum of its proper divisors (651403).

25856243801 is an equidigital number, since it uses as much as digits as its factorization.

25856243801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651402.

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 25856243801 in words is "twenty-five billion, eight hundred fifty-six million, two hundred forty-three thousand, eight hundred one".