26420163409 has 2 divisors, whose sum is σ = 26420163410. Its totient is φ = 26420163408.

The previous prime is 26420163391. The next prime is 26420163481. The reversal of 26420163409 is 90436102462.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22311994384 + 4108169025 = 149372^2 + 64095^2 .

It is a cyclic number.

It is not a de Polignac number, because 26420163409 - 2²³ = 26411774801 is a prime.

It is not a weakly prime, because it can be changed into another prime (26420163109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13210081704 + 13210081705.

It is an arithmetic number, because the mean of its divisors is an integer number (13210081705).

Almost surely, 2^26420163409 is an apocalyptic number.

It is an amenable number.

26420163409 is a deficient number, since it is larger than the sum of its proper divisors (1).

26420163409 is an equidigital number, since it uses as much as digits as its factorization.

26420163409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 26420163409 in words is "twenty-six billion, four hundred twenty million, one hundred sixty-three thousand, four hundred nine".