18861894277 has 4 divisors (see below), whose sum is σ = 18891786976. Its totient is φ = 18832001580.

The previous prime is 18861894251. The next prime is 18861894319. The reversal of 18861894277 is 77249816881.

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.

It is a cyclic number.

It is not a de Polignac number, because 18861894277 - 2¹¹ = 18861892229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861894217) 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 3 ways as a sum of consecutive naturals, for example, 14945403 + ... + 14946664.

It is an arithmetic number, because the mean of its divisors is an integer number (4722946744).

Almost surely, 2^18861894277 is an apocalyptic number.

It is an amenable number.

18861894277 is a deficient number, since it is larger than the sum of its proper divisors (29892699).

18861894277 is an equidigital number, since it uses as much as digits as its factorization.

18861894277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29892698.

The product of its digits is 10838016, while the sum is 61.

The spelling of 18861894277 in words is "eighteen billion, eight hundred sixty-one million, eight hundred ninety-four thousand, two hundred seventy-seven".