25905542860801 has 4 divisors (see below), whose sum is σ = 25906435538004. Its totient is φ = 25904650183600.

The previous prime is 25905542860727. The next prime is 25905542860811. The reversal of 25905542860801 is 10806824550952.

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 19092320514576 + 6813222346225 = 4369476^2 + 2610215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25905542860801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25905542860811) 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, 446295070 + ... + 446353111.

It is an arithmetic number, because the mean of its divisors is an integer number (6476608884501).

Almost surely, 2^{25905542860801} is an apocalyptic number.

It is an amenable number.

25905542860801 is a deficient number, since it is larger than the sum of its proper divisors (892677203).

25905542860801 is an equidigital number, since it uses as much as digits as its factorization.

25905542860801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892677202.

The product of its (nonzero) digits is 6912000, while the sum is 55.

The spelling of 25905542860801 in words is "twenty-five trillion, nine hundred five billion, five hundred forty-two million, eight hundred sixty thousand, eight hundred one".