18738242781 has 8 divisors (see below), whose sum is σ = 25003592064. Its totient is φ = 12482527680.

The previous prime is 18738242759. The next prime is 18738242797. The reversal of 18738242781 is 18724283781.

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

It is not a de Polignac number, because 18738242781 - 2⁵ = 18738242749 is a prime.

It is a super-2 number, since 2×18738242781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18738246781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2404005 + ... + 2411786.

It is an arithmetic number, because the mean of its divisors is an integer number (3125449008).

Almost surely, 2^18738242781 is an apocalyptic number.

It is an amenable number.

18738242781 is a deficient number, since it is larger than the sum of its proper divisors (6265349283).

18738242781 is a wasteful number, since it uses less digits than its factorization.

18738242781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4817091.

The product of its digits is 1204224, while the sum is 51.

The spelling of 18738242781 in words is "eighteen billion, seven hundred thirty-eight million, two hundred forty-two thousand, seven hundred eighty-one".