27777555556 has 27 divisors (see below), whose sum is σ = 49001746899. Its totient is φ = 13777944888.

The previous prime is 27777555551. The next prime is 27777555563. The reversal of 27777555556 is 65555577772.

The square root of 27777555556 is 166666.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27777555494 and 27777555503.

It is not an unprimeable number, because it can be changed into a prime (27777555551) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55666195 + ... + 55666693.

Almost surely, 2^27777555556 is an apocalyptic number.

27777555556 is the 166666-th square number.

It is an amenable number.

27777555556 is a deficient number, since it is larger than the sum of its proper divisors (21224191343).

27777555556 is an frugal number, since it uses more digits than its factorization.

27777555556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336 (or 668 counting only the distinct ones).

The product of its digits is 90037500, while the sum is 61.

The spelling of 27777555556 in words is "twenty-seven billion, seven hundred seventy-seven million, five hundred fifty-five thousand, five hundred fifty-six".