27778336667 has 4 divisors (see below), whose sum is σ = 28048029360. Its totient is φ = 27508643976.

The previous prime is 27778336643. The next prime is 27778336673. The reversal of 27778336667 is 76663387772.

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 27778336667 - 2¹⁰ = 27778335643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27778336697) 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, 134846192 + ... + 134846397.

It is an arithmetic number, because the mean of its divisors is an integer number (7012007340).

Almost surely, 2^27778336667 is an apocalyptic number.

27778336667 is a deficient number, since it is larger than the sum of its proper divisors (269692693).

27778336667 is a wasteful number, since it uses less digits than its factorization.

27778336667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269692692.

The product of its digits is 74680704, while the sum is 62.

The spelling of 27778336667 in words is "twenty-seven billion, seven hundred seventy-eight million, three hundred thirty-six thousand, six hundred sixty-seven".