18939918363 has 4 divisors (see below), whose sum is σ = 25253224488. Its totient is φ = 12626612240.

The previous prime is 18939918359. The next prime is 18939918367. The reversal of 18939918363 is 36381993981.

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

It is an interprime number because it is at equal distance from previous prime (18939918359) and next prime (18939918367).

It is a cyclic number.

It is not a de Polignac number, because 18939918363 - 2² = 18939918359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18939918297 and 18939918306.

It is not an unprimeable number, because it can be changed into a prime (18939918367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3156653058 + ... + 3156653063.

It is an arithmetic number, because the mean of its divisors is an integer number (6313306122).

Almost surely, 2^18939918363 is an apocalyptic number.

18939918363 is a deficient number, since it is larger than the sum of its proper divisors (6313306125).

18939918363 is an equidigital number, since it uses as much as digits as its factorization.

18939918363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6313306124.

The product of its digits is 7558272, while the sum is 60.

The spelling of 18939918363 in words is "eighteen billion, nine hundred thirty-nine million, nine hundred eighteen thousand, three hundred sixty-three".