18745336891 has 8 divisors (see below), whose sum is σ = 18796567104. Its totient is φ = 18694143360.

The previous prime is 18745336889. The next prime is 18745336903. The reversal of 18745336891 is 19863354781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18745336891 - 2¹ = 18745336889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18745336811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1241101 + ... + 1256113.

It is an arithmetic number, because the mean of its divisors is an integer number (2349570888).

Almost surely, 2^18745336891 is an apocalyptic number.

18745336891 is a deficient number, since it is larger than the sum of its proper divisors (51230213).

18745336891 is a wasteful number, since it uses less digits than its factorization.

18745336891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18341.

The product of its digits is 4354560, while the sum is 55.

The spelling of 18745336891 in words is "eighteen billion, seven hundred forty-five million, three hundred thirty-six thousand, eight hundred ninety-one".