27806040261 has 16 divisors (see below), whose sum is σ = 41242461120. Its totient is φ = 18515612880.

The previous prime is 27806040211. The next prime is 27806040329. The reversal of 27806040261 is 16204060872.

27806040261 is a `hidden beast` number, since 27 + 8 + 0 + 604 + 0 + 26 + 1 = 666.

It is not a de Polignac number, because 27806040261 - 2¹⁹ = 27805515973 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27806040211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580635 + ... + 626696.

It is an arithmetic number, because the mean of its divisors is an integer number (2577653820).

Almost surely, 2^27806040261 is an apocalyptic number.

It is an amenable number.

27806040261 is a deficient number, since it is larger than the sum of its proper divisors (13436420859).

27806040261 is a wasteful number, since it uses less digits than its factorization.

27806040261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208193 (or 1208187 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 27806040261 in words is "twenty-seven billion, eight hundred six million, forty thousand, two hundred sixty-one".