26722768621 has 2 divisors, whose sum is σ = 26722768622. Its totient is φ = 26722768620.

The previous prime is 26722768559. The next prime is 26722768637. The reversal of 26722768621 is 12686722762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19290432100 + 7432336521 = 138890^2 + 86211^2 .

It is a cyclic number.

It is not a de Polignac number, because 26722768621 - 2²⁷ = 26588550893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26722768321) 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, 13361384310 + 13361384311.

It is an arithmetic number, because the mean of its divisors is an integer number (13361384311).

Almost surely, 2^26722768621 is an apocalyptic number.

It is an amenable number.

26722768621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26722768621 is an equidigital number, since it uses as much as digits as its factorization.

26722768621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 49.

The spelling of 26722768621 in words is "twenty-six billion, seven hundred twenty-two million, seven hundred sixty-eight thousand, six hundred twenty-one".