18780023819 has 2 divisors, whose sum is σ = 18780023820. Its totient is φ = 18780023818.

The previous prime is 18780023797. The next prime is 18780023827. The reversal of 18780023819 is 91832008781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18780023819 - 2²⁴ = 18763246603 is a prime.

It is a super-2 number, since 2×18780023819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18780053819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9390011909 + 9390011910.

It is an arithmetic number, because the mean of its divisors is an integer number (9390011910).

Almost surely, 2^18780023819 is an apocalyptic number.

18780023819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18780023819 is an equidigital number, since it uses as much as digits as its factorization.

18780023819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The spelling of 18780023819 in words is "eighteen billion, seven hundred eighty million, twenty-three thousand, eight hundred nineteen".