27856477713881 has 2 divisors, whose sum is σ = 27856477713882. Its totient is φ = 27856477713880.

The previous prime is 27856477713877. The next prime is 27856477713929. The reversal of 27856477713881 is 18831777465872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27493663033600 + 362814680281 = 5243440^2 + 602341^2 .

It is a cyclic number.

It is not a de Polignac number, because 27856477713881 - 2² = 27856477713877 is a prime.

It is a super-2 number, since 2×27856477713881² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27856477713799 and 27856477713808.

It is not a weakly prime, because it can be changed into another prime (27856477713811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13928238856940 + 13928238856941.

It is an arithmetic number, because the mean of its divisors is an integer number (13928238856941).

Almost surely, 2^{27856477713881} is an apocalyptic number.

It is an amenable number.

27856477713881 is a deficient number, since it is larger than the sum of its proper divisors (1).

27856477713881 is an equidigital number, since it uses as much as digits as its factorization.

27856477713881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 885104640, while the sum is 74.

The spelling of 27856477713881 in words is "twenty-seven trillion, eight hundred fifty-six billion, four hundred seventy-seven million, seven hundred thirteen thousand, eight hundred eighty-one".