27879981851 has 16 divisors (see below), whose sum is σ = 28920030720. Its totient is φ = 26856113760.

The previous prime is 27879981823. The next prime is 27879981901. The reversal of 27879981851 is 15818997872.

It is a cyclic number.

It is not a de Polignac number, because 27879981851 - 2¹⁰ = 27879980827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27879981751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1880096 + ... + 1894866.

It is an arithmetic number, because the mean of its divisors is an integer number (1807501920).

Almost surely, 2^27879981851 is an apocalyptic number.

27879981851 is a deficient number, since it is larger than the sum of its proper divisors (1040048869).

27879981851 is a wasteful number, since it uses less digits than its factorization.

27879981851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15314.

The product of its digits is 20321280, while the sum is 65.

The spelling of 27879981851 in words is "twenty-seven billion, eight hundred seventy-nine million, nine hundred eighty-one thousand, eight hundred fifty-one".