27954559019521 has 2 divisors, whose sum is σ = 27954559019522. Its totient is φ = 27954559019520.

The previous prime is 27954559019467. The next prime is 27954559019539. The reversal of 27954559019521 is 12591095545972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16115206640625 + 11839352378896 = 4014375^2 + 3440836^2 .

It is a cyclic number.

It is not a de Polignac number, because 27954559019521 - 2¹³ = 27954559011329 is a prime.

It is not a weakly prime, because it can be changed into another prime (27954559019561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13977279509760 + 13977279509761.

It is an arithmetic number, because the mean of its divisors is an integer number (13977279509761).

Almost surely, 2^{27954559019521} is an apocalyptic number.

It is an amenable number.

27954559019521 is a deficient number, since it is larger than the sum of its proper divisors (1).

27954559019521 is an equidigital number, since it uses as much as digits as its factorization.

27954559019521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030000, while the sum is 64.

The spelling of 27954559019521 in words is "twenty-seven trillion, nine hundred fifty-four billion, five hundred fifty-nine million, nineteen thousand, five hundred twenty-one".