27644655061881 has 80 divisors (see below), whose sum is σ = 48540070389888. Its totient is φ = 15457860633600.

The previous prime is 27644655061811. The next prime is 27644655061949. The reversal of 27644655061881 is 18816055644672.

27644655061881 is a `hidden beast` number, since 2 + 7 + 6 + 4 + 4 + 6 + 5 + 5 + 0 + 618 + 8 + 1 = 666.

It is not a de Polignac number, because 27644655061881 - 2⁷ = 27644655061753 is a prime.

It is a super-2 number, since 2×27644655061881² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27644655061811) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 22771276 + ... + 23954546.

Almost surely, 2^{27644655061881} is an apocalyptic number.

It is an amenable number.

27644655061881 is a deficient number, since it is larger than the sum of its proper divisors (20895415328007).

27644655061881 is a wasteful number, since it uses less digits than its factorization.

27644655061881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185324 (or 1185315 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 63.

The spelling of 27644655061881 in words is "twenty-seven trillion, six hundred forty-four billion, six hundred fifty-five million, sixty-one thousand, eight hundred eighty-one".