26918938621 has 2 divisors, whose sum is σ = 26918938622. Its totient is φ = 26918938620.

The previous prime is 26918938619. The next prime is 26918938637. The reversal of 26918938621 is 12683981962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16735303225 + 10183635396 = 129365^2 + 100914^2 .

It is a cyclic number.

It is not a de Polignac number, because 26918938621 - 2¹ = 26918938619 is a prime.

Together with 26918938619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26918938021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13459469310 + 13459469311.

It is an arithmetic number, because the mean of its divisors is an integer number (13459469311).

Almost surely, 2^26918938621 is an apocalyptic number.

It is an amenable number.

26918938621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26918938621 is an equidigital number, since it uses as much as digits as its factorization.

26918938621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 55.

The spelling of 26918938621 in words is "twenty-six billion, nine hundred eighteen million, nine hundred thirty-eight thousand, six hundred twenty-one".