27554418821 has 2 divisors, whose sum is σ = 27554418822. Its totient is φ = 27554418820.

The previous prime is 27554418799. The next prime is 27554418911. The reversal of 27554418821 is 12881445572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19671465025 + 7882953796 = 140255^2 + 88786^2 .

It is a cyclic number.

It is not a de Polignac number, because 27554418821 - 2¹⁴ = 27554402437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27554418421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13777209410 + 13777209411.

It is an arithmetic number, because the mean of its divisors is an integer number (13777209411).

Almost surely, 2^27554418821 is an apocalyptic number.

It is an amenable number.

27554418821 is a deficient number, since it is larger than the sum of its proper divisors (1).

27554418821 is an equidigital number, since it uses as much as digits as its factorization.

27554418821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 716800, while the sum is 47.

The spelling of 27554418821 in words is "twenty-seven billion, five hundred fifty-four million, four hundred eighteen thousand, eight hundred twenty-one".