25855947401 has 2 divisors, whose sum is σ = 25855947402. Its totient is φ = 25855947400.

The previous prime is 25855947353. The next prime is 25855947433. The reversal of 25855947401 is 10474955852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25638414400 + 217533001 = 160120^2 + 14749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25855947401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25855947401.

It is not a weakly prime, because it can be changed into another prime (25855947461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12927973700 + 12927973701.

It is an arithmetic number, because the mean of its divisors is an integer number (12927973701).

Almost surely, 2^25855947401 is an apocalyptic number.

It is an amenable number.

25855947401 is a deficient number, since it is larger than the sum of its proper divisors (1).

25855947401 is an equidigital number, since it uses as much as digits as its factorization.

25855947401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016000, while the sum is 50.

The spelling of 25855947401 in words is "twenty-five billion, eight hundred fifty-five million, nine hundred forty-seven thousand, four hundred one".