27777668447 has 4 divisors (see below), whose sum is σ = 27778749096. Its totient is φ = 27776587800.

The previous prime is 27777668423. The next prime is 27777668459. The reversal of 27777668447 is 74486677772.

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 27777668447 - 2¹⁸ = 27777406303 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 (27777668467) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 500804 + ... + 553497.

It is an arithmetic number, because the mean of its divisors is an integer number (6944687274).

Almost surely, 2^27777668447 is an apocalyptic number.

27777668447 is a deficient number, since it is larger than the sum of its proper divisors (1080649).

27777668447 is a wasteful number, since it uses less digits than its factorization.

27777668447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080648.

The product of its digits is 154893312, while the sum is 65.

The spelling of 27777668447 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred sixty-eight thousand, four hundred forty-seven".