18735453781 has 12 divisors (see below), whose sum is σ = 21488888736. Its totient is φ = 16291696520.

The previous prime is 18735453749. The next prime is 18735453817.

18735453781 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18735453781 - 2⁵ = 18735453749 is a prime.

It is a super-2 number, since 2×18735453781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18735453881) 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 11 ways as a sum of consecutive naturals, for example, 3363271 + ... + 3368836.

It is an arithmetic number, because the mean of its divisors is an integer number (1790740728).

Almost surely, 2^18735453781 is an apocalyptic number.

18735453781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18735453781 is a deficient number, since it is larger than the sum of its proper divisors (2753434955).

18735453781 is a wasteful number, since it uses less digits than its factorization.

18735453781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6732152 (or 6732141 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 52.

The spelling of 18735453781 in words is "eighteen billion, seven hundred thirty-five million, four hundred fifty-three thousand, seven hundred eighty-one".