26921405549 has 2 divisors, whose sum is σ = 26921405550. Its totient is φ = 26921405548.

The previous prime is 26921405519. The next prime is 26921405573. The reversal of 26921405549 is 94550412962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23056296649 + 3865108900 = 151843^2 + 62170^2 .

It is a cyclic number.

It is not a de Polignac number, because 26921405549 - 2³² = 22626438253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26921405519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13460702774 + 13460702775.

It is an arithmetic number, because the mean of its divisors is an integer number (13460702775).

Almost surely, 2^26921405549 is an apocalyptic number.

It is an amenable number.

26921405549 is a deficient number, since it is larger than the sum of its proper divisors (1).

26921405549 is an equidigital number, since it uses as much as digits as its factorization.

26921405549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 26921405549 in words is "twenty-six billion, nine hundred twenty-one million, four hundred five thousand, five hundred forty-nine".