26013101666557 has 2 divisors, whose sum is σ = 26013101666558. Its totient is φ = 26013101666556.

The previous prime is 26013101666543. The next prime is 26013101666581. The reversal of 26013101666557 is 75566610131062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16515234443236 + 9497867223321 = 4063894^2 + 3081861^2 .

It is a cyclic number.

It is not a de Polignac number, because 26013101666557 - 2⁷ = 26013101666429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26013101666557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26013101669557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13006550833278 + 13006550833279.

It is an arithmetic number, because the mean of its divisors is an integer number (13006550833279).

Almost surely, 2^{26013101666557} is an apocalyptic number.

It is an amenable number.

26013101666557 is a deficient number, since it is larger than the sum of its proper divisors (1).

26013101666557 is an equidigital number, since it uses as much as digits as its factorization.

26013101666557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 26013101666557 in words is "twenty-six trillion, thirteen billion, one hundred one million, six hundred sixty-six thousand, five hundred fifty-seven".