26087570812981 has 2 divisors, whose sum is σ = 26087570812982. Its totient is φ = 26087570812980.

The previous prime is 26087570812967. The next prime is 26087570812987. The reversal of 26087570812981 is 18921807578062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18832041368100 + 7255529444881 = 4339590^2 + 2693609^2 .

It is a cyclic number.

It is not a de Polignac number, because 26087570812981 - 2³¹ = 26085423329333 is a prime.

It is a super-2 number, since 2×26087570812981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26087570812987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13043785406490 + 13043785406491.

It is an arithmetic number, because the mean of its divisors is an integer number (13043785406491).

Almost surely, 2^{26087570812981} is an apocalyptic number.

It is an amenable number.

26087570812981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26087570812981 is an equidigital number, since it uses as much as digits as its factorization.

26087570812981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27095040, while the sum is 64.

The spelling of 26087570812981 in words is "twenty-six trillion, eighty-seven billion, five hundred seventy million, eight hundred twelve thousand, nine hundred eighty-one".