27805770655 has 32 divisors (see below), whose sum is σ = 37349694144. Its totient is φ = 19737686016.

The previous prime is 27805770653. The next prime is 27805770731. The reversal of 27805770655 is 55607750872.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27805770655 - 2¹ = 27805770653 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 (27805770653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129967 + ... + 269263.

It is an arithmetic number, because the mean of its divisors is an integer number (1167177942).

Almost surely, 2^27805770655 is an apocalyptic number.

27805770655 is a deficient number, since it is larger than the sum of its proper divisors (9543923489).

27805770655 is a wasteful number, since it uses less digits than its factorization.

27805770655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139435.

The product of its (nonzero) digits is 4116000, while the sum is 52.

The spelling of 27805770655 in words is "twenty-seven billion, eight hundred five million, seven hundred seventy thousand, six hundred fifty-five".