26621282621 has 2 divisors, whose sum is σ = 26621282622. Its totient is φ = 26621282620.

The previous prime is 26621282599. The next prime is 26621282669. The reversal of 26621282621 is 12628212662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26598348100 + 22934521 = 163090^2 + 4789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26621282621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26621282521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13310641310 + 13310641311.

It is an arithmetic number, because the mean of its divisors is an integer number (13310641311).

Almost surely, 2^26621282621 is an apocalyptic number.

It is an amenable number.

26621282621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26621282621 is an equidigital number, since it uses as much as digits as its factorization.

26621282621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 38.

The spelling of 26621282621 in words is "twenty-six billion, six hundred twenty-one million, two hundred eighty-two thousand, six hundred twenty-one".