25027436981 has 2 divisors, whose sum is σ = 25027436982. Its totient is φ = 25027436980.

The previous prime is 25027436977. The next prime is 25027436989. The reversal of 25027436981 is 18963472052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16258800100 + 8768636881 = 127510^2 + 93641^2 .

It is a cyclic number.

It is not a de Polignac number, because 25027436981 - 2² = 25027436977 is a prime.

It is a super-2 number, since 2×25027436981² (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 (25027436989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12513718490 + 12513718491.

It is an arithmetic number, because the mean of its divisors is an integer number (12513718491).

It is a 1-persistent number, because it is pandigital, but 2⋅25027436981 = 50054873962 is not.

Almost surely, 2^25027436981 is an apocalyptic number.

It is an amenable number.

25027436981 is a deficient number, since it is larger than the sum of its proper divisors (1).

25027436981 is an equidigital number, since it uses as much as digits as its factorization.

25027436981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 25027436981 in words is "twenty-five billion, twenty-seven million, four hundred thirty-six thousand, nine hundred eighty-one".