18805620311 has 2 divisors, whose sum is σ = 18805620312. Its totient is φ = 18805620310.

The previous prime is 18805620299. The next prime is 18805620313. The reversal of 18805620311 is 11302650881.

It is a strong prime.

It is an emirp because it is prime and its reverse (11302650881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18805620311 - 2⁶ = 18805620247 is a prime.

Together with 18805620313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18805620313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9402810155 + 9402810156.

It is an arithmetic number, because the mean of its divisors is an integer number (9402810156).

Almost surely, 2^18805620311 is an apocalyptic number.

18805620311 is a deficient number, since it is larger than the sum of its proper divisors (1).

18805620311 is an equidigital number, since it uses as much as digits as its factorization.

18805620311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 18805620311 in words is "eighteen billion, eight hundred five million, six hundred twenty thousand, three hundred eleven".