25055050781 has 2 divisors, whose sum is σ = 25055050782. Its totient is φ = 25055050780.

The previous prime is 25055050763. The next prime is 25055050849. The reversal of 25055050781 is 18705055052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20489345881 + 4565704900 = 143141^2 + 67570^2 .

It is a cyclic number.

It is not a de Polignac number, because 25055050781 - 2²⁶ = 24987941917 is a prime.

It is a super-2 number, since 2×25055050781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25055050481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12527525390 + 12527525391.

It is an arithmetic number, because the mean of its divisors is an integer number (12527525391).

Almost surely, 2^25055050781 is an apocalyptic number.

It is an amenable number.

25055050781 is a deficient number, since it is larger than the sum of its proper divisors (1).

25055050781 is an equidigital number, since it uses as much as digits as its factorization.

25055050781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70000, while the sum is 38.

The spelling of 25055050781 in words is "twenty-five billion, fifty-five million, fifty thousand, seven hundred eighty-one".