27806581166 has 32 divisors (see below), whose sum is σ = 51739484160. Its totient is φ = 10913779296.

The previous prime is 27806581157. The next prime is 27806581217. The reversal of 27806581166 is 66118560872.

It is a super-2 number, since 2×27806581166² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578396 + ... + 624623.

It is an arithmetic number, because the mean of its divisors is an integer number (1616858880).

Almost surely, 2^27806581166 is an apocalyptic number.

27806581166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

27806581166 is a deficient number, since it is larger than the sum of its proper divisors (23932902994).

27806581166 is a wasteful number, since it uses less digits than its factorization.

27806581166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203168.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 27806581166 in words is "twenty-seven billion, eight hundred six million, five hundred eighty-one thousand, one hundred sixty-six".