26440663477 has 2 divisors, whose sum is σ = 26440663478. Its totient is φ = 26440663476.

The previous prime is 26440663427. The next prime is 26440663507. The reversal of 26440663477 is 77436604462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13383944721 + 13056718756 = 115689^2 + 114266^2 .

It is a cyclic number.

It is not a de Polignac number, because 26440663477 - 2⁷ = 26440663349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26440663477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26440663427) 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, 13220331738 + 13220331739.

It is an arithmetic number, because the mean of its divisors is an integer number (13220331739).

Almost surely, 2^26440663477 is an apocalyptic number.

It is an amenable number.

26440663477 is a deficient number, since it is larger than the sum of its proper divisors (1).

26440663477 is an equidigital number, since it uses as much as digits as its factorization.

26440663477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4064256, while the sum is 49.

The spelling of 26440663477 in words is "twenty-six billion, four hundred forty million, six hundred sixty-three thousand, four hundred seventy-seven".