18768620009 has 8 divisors (see below), whose sum is σ = 18888553992. Its totient is φ = 18648817920.

The previous prime is 18768619999. The next prime is 18768620023. The reversal of 18768620009 is 90002686781.

It can be written as a sum of positive squares in 4 ways, for example, as 4146973609 + 14621646400 = 64397^2 + 120920^2 .

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 18768620009 - 2⁴ = 18768619993 is a prime.

It is a super-2 number, since 2×18768620009² (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 (18768620029) 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 7 ways as a sum of consecutive naturals, for example, 260849 + ... + 324929.

It is an arithmetic number, because the mean of its divisors is an integer number (2361069249).

Almost surely, 2^18768620009 is an apocalyptic number.

It is an amenable number.

18768620009 is a deficient number, since it is larger than the sum of its proper divisors (119933983).

18768620009 is a wasteful number, since it uses less digits than its factorization.

18768620009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65947.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 18768620009 in words is "eighteen billion, seven hundred sixty-eight million, six hundred twenty thousand, nine".