27780333261 has 16 divisors (see below), whose sum is σ = 37245754368. Its totient is φ = 18417627200.

The previous prime is 27780333247. The next prime is 27780333293. The reversal of 27780333261 is 16233308772.

It is a cyclic number.

It is not a de Polignac number, because 27780333261 - 2⁶ = 27780333197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27780333461) 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 15 ways as a sum of consecutive naturals, for example, 2789551 + ... + 2799491.

It is an arithmetic number, because the mean of its divisors is an integer number (2327859648).

Almost surely, 2^27780333261 is an apocalyptic number.

It is an amenable number.

27780333261 is a deficient number, since it is larger than the sum of its proper divisors (9465421107).

27780333261 is a wasteful number, since it uses less digits than its factorization.

27780333261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15012.

The product of its (nonzero) digits is 254016, while the sum is 42.

The spelling of 27780333261 in words is "twenty-seven billion, seven hundred eighty million, three hundred thirty-three thousand, two hundred sixty-one".