18963418073 has 4 divisors (see below), whose sum is σ = 19321218468. Its totient is φ = 18605617680.

The previous prime is 18963418069. The next prime is 18963418079. The reversal of 18963418073 is 37081436981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11403463369 + 7559954704 = 106787^2 + 86948^2 .

It is a cyclic number.

It is not a de Polignac number, because 18963418073 - 2² = 18963418069 is a prime.

It is a super-2 number, since 2×18963418073² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18963418079) 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 3 ways as a sum of consecutive naturals, for example, 178900118 + ... + 178900223.

It is an arithmetic number, because the mean of its divisors is an integer number (4830304617).

Almost surely, 2^18963418073 is an apocalyptic number.

It is an amenable number.

18963418073 is a deficient number, since it is larger than the sum of its proper divisors (357800395).

18963418073 is an equidigital number, since it uses as much as digits as its factorization.

18963418073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357800394.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 18963418073 in words is "eighteen billion, nine hundred sixty-three million, four hundred eighteen thousand, seventy-three".