18715644945 has 48 divisors (see below), whose sum is σ = 34462576512. Its totient is φ = 9738195840.

The previous prime is 18715644923. The next prime is 18715644977. The reversal of 18715644945 is 54944651781.

18715644945 is a `hidden beast` number, since 1 + 8 + 7 + 156 + 449 + 45 = 666.

It is not a de Polignac number, because 18715644945 - 2¹⁹ = 18715120657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18715644891 and 18715644900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138037 + ... + 237666.

It is an arithmetic number, because the mean of its divisors is an integer number (717970344).

Almost surely, 2^18715644945 is an apocalyptic number.

18715644945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18715644945 is a deficient number, since it is larger than the sum of its proper divisors (15746931567).

18715644945 is an equidigital number, since it uses as much as digits as its factorization.

18715644945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375764 (or 375752 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 18715644945 in words is "eighteen billion, seven hundred fifteen million, six hundred forty-four thousand, nine hundred forty-five".