26725025981 has 2 divisors, whose sum is σ = 26725025982. Its totient is φ = 26725025980.

The previous prime is 26725025939. The next prime is 26725025983. The reversal of 26725025981 is 18952052762.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26614985881 + 110040100 = 163141^2 + 10490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26725025981 is a prime.

It is a super-2 number, since 2×26725025981² (a number of 22 digits) contains 22 as substring.

Together with 26725025983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26725025983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13362512990 + 13362512991.

It is an arithmetic number, because the mean of its divisors is an integer number (13362512991).

Almost surely, 2^26725025981 is an apocalyptic number.

It is an amenable number.

26725025981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26725025981 is an equidigital number, since it uses as much as digits as its factorization.

26725025981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 26725025981 in words is "twenty-six billion, seven hundred twenty-five million, twenty-five thousand, nine hundred eighty-one".