18779424819 has 4 divisors (see below), whose sum is σ = 25039233096. Its totient is φ = 12519616544.

The previous prime is 18779424751. The next prime is 18779424821. The reversal of 18779424819 is 91842497781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91842497781 = 3 ⋅30614165927.

It is a cyclic number.

It is not a de Polignac number, because 18779424819 - 2⁷ = 18779424691 is a prime.

It is a super-2 number, since 2×18779424819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18779424889) 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, 3129904134 + ... + 3129904139.

It is an arithmetic number, because the mean of its divisors is an integer number (6259808274).

Almost surely, 2^18779424819 is an apocalyptic number.

18779424819 is a deficient number, since it is larger than the sum of its proper divisors (6259808277).

18779424819 is an equidigital number, since it uses as much as digits as its factorization.

18779424819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6259808276.

The product of its digits is 8128512, while the sum is 60.

The spelling of 18779424819 in words is "eighteen billion, seven hundred seventy-nine million, four hundred twenty-four thousand, eight hundred nineteen".