27866161781473 has 2 divisors, whose sum is σ = 27866161781474. Its totient is φ = 27866161781472.

The previous prime is 27866161781449. The next prime is 27866161781543. The reversal of 27866161781473 is 37418716166872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27823588887249 + 42572894224 = 5274807^2 + 206332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27866161781473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27866161781399 and 27866161781408.

It is not a weakly prime, because it can be changed into another prime (27866161787473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13933080890736 + 13933080890737.

It is an arithmetic number, because the mean of its divisors is an integer number (13933080890737).

Almost surely, 2^{27866161781473} is an apocalyptic number.

It is an amenable number.

27866161781473 is a deficient number, since it is larger than the sum of its proper divisors (1).

27866161781473 is an equidigital number, since it uses as much as digits as its factorization.

27866161781473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113799168, while the sum is 67.

The spelling of 27866161781473 in words is "twenty-seven trillion, eight hundred sixty-six billion, one hundred sixty-one million, seven hundred eighty-one thousand, four hundred seventy-three".