27777657983 has 4 divisors (see below), whose sum is σ = 27789495720. Its totient is φ = 27765820248.

The previous prime is 27777657967. The next prime is 27777657997. The reversal of 27777657983 is 38975677772.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27777657983 - 2⁴ = 27777657967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27777657283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5915348 + ... + 5920041.

It is an arithmetic number, because the mean of its divisors is an integer number (6947373930).

Almost surely, 2^27777657983 is an apocalyptic number.

27777657983 is a deficient number, since it is larger than the sum of its proper divisors (11837737).

27777657983 is a wasteful number, since it uses less digits than its factorization.

27777657983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11837736.

The product of its digits is 217818720, while the sum is 68.

The spelling of 27777657983 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred fifty-seven thousand, nine hundred eighty-three".