26785281643 has 2 divisors, whose sum is σ = 26785281644. Its totient is φ = 26785281642.

The previous prime is 26785281539. The next prime is 26785281703. The reversal of 26785281643 is 34618258762.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26785281643 - 2¹⁷ = 26785150571 is a prime.

It is not a weakly prime, because it can be changed into another prime (26785281043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13392640821 + 13392640822.

It is an arithmetic number, because the mean of its divisors is an integer number (13392640822).

Almost surely, 2^26785281643 is an apocalyptic number.

26785281643 is a deficient number, since it is larger than the sum of its proper divisors (1).

26785281643 is an equidigital number, since it uses as much as digits as its factorization.

26785281643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 52.

The spelling of 26785281643 in words is "twenty-six billion, seven hundred eighty-five million, two hundred eighty-one thousand, six hundred forty-three".