27981899854785 has 96 divisors (see below), whose sum is σ = 51846498662400. Its totient is φ = 13911452319744.

The previous prime is 27981899854729. The next prime is 27981899854801. The reversal of 27981899854785 is 58745899818972.

27981899854785 is a `hidden beast` number, since 279 + 8 + 189 + 9 + 85 + 4 + 7 + 85 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-27981899854785 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27981899854695 and 27981899854704.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 392786529 + ... + 392857761.

It is an arithmetic number, because the mean of its divisors is an integer number (540067694400).

Almost surely, 2^{27981899854785} is an apocalyptic number.

It is an amenable number.

27981899854785 is a deficient number, since it is larger than the sum of its proper divisors (23864598807615).

27981899854785 is a wasteful number, since it uses less digits than its factorization.

27981899854785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76167 (or 76164 counting only the distinct ones).

The product of its digits is 29262643200, while the sum is 90.

The spelling of 27981899854785 in words is "twenty-seven trillion, nine hundred eighty-one billion, eight hundred ninety-nine million, eight hundred fifty-four thousand, seven hundred eighty-five".