27777657985 has 16 divisors (see below), whose sum is σ = 41558262912. Its totient is φ = 17315942400.

The previous prime is 27777657967. The next prime is 27777657997. The reversal of 27777657985 is 58975677772.

It is not a de Polignac number, because 27777657985 - 2⁹ = 27777657473 is a prime.

It is a Duffinian 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, 36074496 + ... + 36075265.

It is an arithmetic number, because the mean of its divisors is an integer number (2597391432).

Almost surely, 2^27777657985 is an apocalyptic number.

It is an amenable number.

27777657985 is a deficient number, since it is larger than the sum of its proper divisors (13780604927).

27777657985 is a wasteful number, since it uses less digits than its factorization.

27777657985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72149784.

The product of its digits is 363031200, while the sum is 70.

The spelling of 27777657985 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred fifty-seven thousand, nine hundred eighty-five".