18774932861 has 4 divisors (see below), whose sum is σ = 18775206912. Its totient is φ = 18774658812.

The previous prime is 18774932837. The next prime is 18774932881. The reversal of 18774932861 is 16823947781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18774932861 - 2¹⁰ = 18774931837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18774932797 and 18774932806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18774932881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67076 + ... + 205058.

It is an arithmetic number, because the mean of its divisors is an integer number (4693801728).

Almost surely, 2^18774932861 is an apocalyptic number.

It is an amenable number.

18774932861 is a deficient number, since it is larger than the sum of its proper divisors (274051).

18774932861 is a wasteful number, since it uses less digits than its factorization.

18774932861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274050.

The product of its digits is 4064256, while the sum is 56.

The spelling of 18774932861 in words is "eighteen billion, seven hundred seventy-four million, nine hundred thirty-two thousand, eight hundred sixty-one".