27778333321 has 2 divisors, whose sum is σ = 27778333322. Its totient is φ = 27778333320.

The previous prime is 27778333259. The next prime is 27778333337. The reversal of 27778333321 is 12333387772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27402167296 + 376166025 = 165536^2 + 19395^2 .

It is a cyclic number.

It is not a de Polignac number, because 27778333321 - 2²⁷ = 27644115593 is a prime.

It is not a weakly prime, because it can be changed into another prime (27778333351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13889166660 + 13889166661.

It is an arithmetic number, because the mean of its divisors is an integer number (13889166661).

Almost surely, 2^27778333321 is an apocalyptic number.

It is an amenable number.

27778333321 is a deficient number, since it is larger than the sum of its proper divisors (1).

27778333321 is an equidigital number, since it uses as much as digits as its factorization.

27778333321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 46.

The spelling of 27778333321 in words is "twenty-seven billion, seven hundred seventy-eight million, three hundred thirty-three thousand, three hundred twenty-one".