18401342781 has 8 divisors (see below), whose sum is σ = 24542251200. Its totient is φ = 12263998112.

The previous prime is 18401342753. The next prime is 18401342783. The reversal of 18401342781 is 18724310481.

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 18401342781 - 2⁹ = 18401342269 is a prime.

It is a super-2 number, since 2×18401342781² (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 (18401342783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 878865 + ... + 899558.

It is an arithmetic number, because the mean of its divisors is an integer number (3067781400).

Almost surely, 2^18401342781 is an apocalyptic number.

It is an amenable number.

18401342781 is a deficient number, since it is larger than the sum of its proper divisors (6140908419).

18401342781 is a wasteful number, since it uses less digits than its factorization.

18401342781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781875.

The product of its (nonzero) digits is 43008, while the sum is 39.

The spelling of 18401342781 in words is "eighteen billion, four hundred one million, three hundred forty-two thousand, seven hundred eighty-one".