25772928481 has 2 divisors, whose sum is σ = 25772928482. Its totient is φ = 25772928480.

The previous prime is 25772928473. The next prime is 25772928497. The reversal of 25772928481 is 18482927752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23445734400 + 2327194081 = 153120^2 + 48241^2 .

It is a cyclic number.

It is not a de Polignac number, because 25772928481 - 2³ = 25772928473 is a prime.

It is a super-2 number, since 2×25772928481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25772923481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12886464240 + 12886464241.

It is an arithmetic number, because the mean of its divisors is an integer number (12886464241).

Almost surely, 2^25772928481 is an apocalyptic number.

It is an amenable number.

25772928481 is a deficient number, since it is larger than the sum of its proper divisors (1).

25772928481 is an equidigital number, since it uses as much as digits as its factorization.

25772928481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 55.

The spelling of 25772928481 in words is "twenty-five billion, seven hundred seventy-two million, nine hundred twenty-eight thousand, four hundred eighty-one".