18826172811 has 6 divisors (see below), whose sum is σ = 27193360740. Its totient is φ = 12550781868.

The previous prime is 18826172801. The next prime is 18826172879. The reversal of 18826172811 is 11827162881.

18826172811 is a `hidden beast` number, since 1 + 8 + 8 + 2 + 617 + 28 + 1 + 1 = 666.

It is not a de Polignac number, because 18826172811 - 2⁵ = 18826172779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18826172801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1045898481 + ... + 1045898498.

It is an arithmetic number, because the mean of its divisors is an integer number (4532226790).

Almost surely, 2^18826172811 is an apocalyptic number.

18826172811 is a deficient number, since it is larger than the sum of its proper divisors (8367187929).

18826172811 is a wasteful number, since it uses less digits than its factorization.

18826172811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091796985 (or 2091796982 counting only the distinct ones).

The product of its digits is 86016, while the sum is 45.

The spelling of 18826172811 in words is "eighteen billion, eight hundred twenty-six million, one hundred seventy-two thousand, eight hundred eleven".