18351783945 has 24 divisors (see below), whose sum is σ = 34701556032. Its totient is φ = 8897834400.

The previous prime is 18351783929. The next prime is 18351783949. The reversal of 18351783945 is 54938715381.

18351783945 is a `hidden beast` number, since 1 + 8 + 3 + 517 + 83 + 9 + 45 = 666.

It is not a de Polignac number, because 18351783945 - 2⁴ = 18351783929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18351783891 and 18351783900.

It is not an unprimeable number, because it can be changed into a prime (18351783949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18536661 + ... + 18537650.

It is an arithmetic number, because the mean of its divisors is an integer number (1445898168).

Almost surely, 2^18351783945 is an apocalyptic number.

18351783945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18351783945 is a deficient number, since it is larger than the sum of its proper divisors (16349772087).

18351783945 is a wasteful number, since it uses less digits than its factorization.

18351783945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37074333 (or 37074330 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 18351783945 in words is "eighteen billion, three hundred fifty-one million, seven hundred eighty-three thousand, nine hundred forty-five".