25554122981 has 2 divisors, whose sum is σ = 25554122982. Its totient is φ = 25554122980.

The previous prime is 25554122897. The next prime is 25554123029. The reversal of 25554122981 is 18922145552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24545488900 + 1008634081 = 156670^2 + 31759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25554122981 is a prime.

It is a super-2 number, since 2×25554122981² (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 (25554122281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12777061490 + 12777061491.

It is an arithmetic number, because the mean of its divisors is an integer number (12777061491).

Almost surely, 2^25554122981 is an apocalyptic number.

It is an amenable number.

25554122981 is a deficient number, since it is larger than the sum of its proper divisors (1).

25554122981 is an equidigital number, since it uses as much as digits as its factorization.

25554122981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288000, while the sum is 44.

The spelling of 25554122981 in words is "twenty-five billion, five hundred fifty-four million, one hundred twenty-two thousand, nine hundred eighty-one".