27780005555 has 4 divisors (see below), whose sum is σ = 33336006672. Its totient is φ = 22224004440.

The previous prime is 27780005549. The next prime is 27780005569. The reversal of 27780005555 is 55550008772.

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

It is not a de Polignac number, because 27780005555 - 2³² = 23485038259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2778000551 + ... + 2778000560.

It is an arithmetic number, because the mean of its divisors is an integer number (8334001668).

Almost surely, 2^27780005555 is an apocalyptic number.

27780005555 is a deficient number, since it is larger than the sum of its proper divisors (5556001117).

27780005555 is an equidigital number, since it uses as much as digits as its factorization.

27780005555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5556001116.

The product of its (nonzero) digits is 490000, while the sum is 44.

The spelling of 27780005555 in words is "twenty-seven billion, seven hundred eighty million, five thousand, five hundred fifty-five".