26870634638621 has 2 divisors, whose sum is σ = 26870634638622. Its totient is φ = 26870634638620.

The previous prime is 26870634638599. The next prime is 26870634638629. The reversal of 26870634638621 is 12683643607862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17118823500100 + 9751811138521 = 4137490^2 + 3122789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26870634638621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26870634638629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13435317319310 + 13435317319311.

It is an arithmetic number, because the mean of its divisors is an integer number (13435317319311).

Almost surely, 2^{26870634638621} is an apocalyptic number.

It is an amenable number.

26870634638621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26870634638621 is an equidigital number, since it uses as much as digits as its factorization.

26870634638621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 83607552, while the sum is 62.

The spelling of 26870634638621 in words is "twenty-six trillion, eight hundred seventy billion, six hundred thirty-four million, six hundred thirty-eight thousand, six hundred twenty-one".