26416642666639 has 2 divisors, whose sum is σ = 26416642666640. Its totient is φ = 26416642666638.

The previous prime is 26416642666613. The next prime is 26416642666663. The reversal of 26416642666639 is 93666624661462.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26416642666639 - 2⁵ = 26416642666607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26416642606639) 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, 13208321333319 + 13208321333320.

It is an arithmetic number, because the mean of its divisors is an integer number (13208321333320).

Almost surely, 2^{26416642666639} is an apocalyptic number.

26416642666639 is a deficient number, since it is larger than the sum of its proper divisors (1).

26416642666639 is an equidigital number, since it uses as much as digits as its factorization.

26416642666639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483729408, while the sum is 67.

The spelling of 26416642666639 in words is "twenty-six trillion, four hundred sixteen billion, six hundred forty-two million, six hundred sixty-six thousand, six hundred thirty-nine".