27981641919618 has 40 divisors (see below), whose sum is σ = 62849246256720. Its totient is φ = 9304953296760.

The previous prime is 27981641919593. The next prime is 27981641919709. The reversal of 27981641919618 is 81691914618972.

27981641919618 is a `hidden beast` number, since 2 + 7 + 9 + 8 + 1 + 6 + 419 + 196 + 18 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 206049288 + ... + 206185043.

It is an arithmetic number, because the mean of its divisors is an integer number (1571231156418).

Almost surely, 2^{27981641919618} is an apocalyptic number.

27981641919618 is an abundant number, since it is smaller than the sum of its proper divisors (34867604337102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27981641919618 is a wasteful number, since it uses less digits than its factorization.

27981641919618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412234764 (or 412234755 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 72.

The spelling of 27981641919618 in words is "twenty-seven trillion, nine hundred eighty-one billion, six hundred forty-one million, nine hundred nineteen thousand, six hundred eighteen".