27163807955781 has 24 divisors (see below), whose sum is σ = 42166701226944. Its totient is φ = 15509251497600.

The previous prime is 27163807955777. The next prime is 27163807955819. The reversal of 27163807955781 is 18755970836172.

It is not a de Polignac number, because 27163807955781 - 2² = 27163807955777 is a prime.

It is a super-2 number, since 2×27163807955781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27163807955731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76754265 + ... + 77107358.

It is an arithmetic number, because the mean of its divisors is an integer number (1756945884456).

Almost surely, 2^{27163807955781} is an apocalyptic number.

27163807955781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27163807955781 is a deficient number, since it is larger than the sum of its proper divisors (15002893271163).

27163807955781 is a wasteful number, since it uses less digits than its factorization.

27163807955781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153862841 (or 153862834 counting only the distinct ones).

The product of its (nonzero) digits is 177811200, while the sum is 69.

The spelling of 27163807955781 in words is "twenty-seven trillion, one hundred sixty-three billion, eight hundred seven million, nine hundred fifty-five thousand, seven hundred eighty-one".