25803557881 has 2 divisors, whose sum is σ = 25803557882. Its totient is φ = 25803557880.

The previous prime is 25803557869. The next prime is 25803557891. The reversal of 25803557881 is 18875530852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16038956025 + 9764601856 = 126645^2 + 98816^2 .

It is a cyclic number.

It is not a de Polignac number, because 25803557881 - 2¹⁵ = 25803525113 is a prime.

It is a super-2 number, since 2×25803557881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25803557821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12901778940 + 12901778941.

It is an arithmetic number, because the mean of its divisors is an integer number (12901778941).

Almost surely, 2^25803557881 is an apocalyptic number.

It is an amenable number.

25803557881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25803557881 is an equidigital number, since it uses as much as digits as its factorization.

25803557881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688000, while the sum is 52.

The spelling of 25803557881 in words is "twenty-five billion, eight hundred three million, five hundred fifty-seven thousand, eight hundred eighty-one".