18903821811 has 16 divisors (see below), whose sum is σ = 29584360704. Its totient is φ = 10510232544.

The previous prime is 18903821803. The next prime is 18903821851. The reversal of 18903821811 is 11812830981.

It is not a de Polignac number, because 18903821811 - 2³ = 18903821803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18903821801) 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 15 ways as a sum of consecutive naturals, for example, 12163845 + ... + 12165398.

It is an arithmetic number, because the mean of its divisors is an integer number (1849022544).

Almost surely, 2^18903821811 is an apocalyptic number.

18903821811 is a deficient number, since it is larger than the sum of its proper divisors (10680538893).

18903821811 is a wasteful number, since it uses less digits than its factorization.

18903821811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24329290.

The product of its (nonzero) digits is 27648, while the sum is 42.

The spelling of 18903821811 in words is "eighteen billion, nine hundred three million, eight hundred twenty-one thousand, eight hundred eleven".