25801930381 has 2 divisors, whose sum is σ = 25801930382. Its totient is φ = 25801930380.

The previous prime is 25801930379. The next prime is 25801930393. The reversal of 25801930381 is 18303910852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24006713481 + 1795216900 = 154941^2 + 42370^2 .

It is a cyclic number.

It is not a de Polignac number, because 25801930381 - 2¹ = 25801930379 is a prime.

It is a super-2 number, since 2×25801930381² (a number of 22 digits) contains 22 as substring.

Together with 25801930379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25801930321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12900965190 + 12900965191.

It is an arithmetic number, because the mean of its divisors is an integer number (12900965191).

Almost surely, 2^25801930381 is an apocalyptic number.

It is an amenable number.

25801930381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25801930381 is an equidigital number, since it uses as much as digits as its factorization.

25801930381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 25801930381 in words is "twenty-five billion, eight hundred one million, nine hundred thirty thousand, three hundred eighty-one".