26940509657 has 2 divisors, whose sum is σ = 26940509658. Its totient is φ = 26940509656.

The previous prime is 26940509579. The next prime is 26940509677. The reversal of 26940509657 is 75690504962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19816474441 + 7124035216 = 140771^2 + 84404^2 .

It is a cyclic number.

It is not a de Polignac number, because 26940509657 - 2²² = 26936315353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26940509599 and 26940509608.

It is not a weakly prime, because it can be changed into another prime (26940509677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13470254828 + 13470254829.

It is an arithmetic number, because the mean of its divisors is an integer number (13470254829).

Almost surely, 2^26940509657 is an apocalyptic number.

It is an amenable number.

26940509657 is a deficient number, since it is larger than the sum of its proper divisors (1).

26940509657 is an equidigital number, since it uses as much as digits as its factorization.

26940509657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4082400, while the sum is 53.

The spelling of 26940509657 in words is "twenty-six billion, nine hundred forty million, five hundred nine thousand, six hundred fifty-seven".