27838762565861 has 32 divisors (see below), whose sum is σ = 30773645430528. Its totient is φ = 25021002746880.

The previous prime is 27838762565819. The next prime is 27838762565891. The reversal of 27838762565861 is 16856526783872.

It is a cyclic number.

It is not a de Polignac number, because 27838762565861 - 2⁶ = 27838762565797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27838762565891) 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 31 ways as a sum of consecutive naturals, for example, 1822974656 + ... + 1822989926.

It is an arithmetic number, because the mean of its divisors is an integer number (961676419704).

Almost surely, 2^{27838762565861} is an apocalyptic number.

It is an amenable number.

27838762565861 is a deficient number, since it is larger than the sum of its proper divisors (2934882864667).

27838762565861 is a wasteful number, since it uses less digits than its factorization.

27838762565861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25341.

The product of its digits is 1625702400, while the sum is 74.

The spelling of 27838762565861 in words is "twenty-seven trillion, eight hundred thirty-eight billion, seven hundred sixty-two million, five hundred sixty-five thousand, eight hundred sixty-one".