26621161891 has 2 divisors, whose sum is σ = 26621161892. Its totient is φ = 26621161890.

The previous prime is 26621161859. The next prime is 26621161933. The reversal of 26621161891 is 19816112662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26621161891 - 2⁵ = 26621161859 is a prime.

It is not a weakly prime, because it can be changed into another prime (26621162891) 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, 13310580945 + 13310580946.

It is an arithmetic number, because the mean of its divisors is an integer number (13310580946).

Almost surely, 2^26621161891 is an apocalyptic number.

26621161891 is a deficient number, since it is larger than the sum of its proper divisors (1).

26621161891 is an equidigital number, since it uses as much as digits as its factorization.

26621161891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 43.

The spelling of 26621161891 in words is "twenty-six billion, six hundred twenty-one million, one hundred sixty-one thousand, eight hundred ninety-one".