27768556213 has 16 divisors (see below), whose sum is σ = 29854446336. Its totient is φ = 25767815040.

The previous prime is 27768556181. The next prime is 27768556243. The reversal of 27768556213 is 31265586772.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27768556213 - 2⁵ = 27768556181 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 (27768556243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33145 + ... + 237982.

It is an arithmetic number, because the mean of its divisors is an integer number (1865902896).

Almost surely, 2^27768556213 is an apocalyptic number.

27768556213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

27768556213 is a deficient number, since it is larger than the sum of its proper divisors (2085890123).

27768556213 is a wasteful number, since it uses less digits than its factorization.

27768556213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271284.

The product of its digits is 4233600, while the sum is 52.

The spelling of 27768556213 in words is "twenty-seven billion, seven hundred sixty-eight million, five hundred fifty-six thousand, two hundred thirteen".