18776839349 has 4 divisors (see below), whose sum is σ = 18795376236. Its totient is φ = 18758302464.

The previous prime is 18776839309. The next prime is 18776839373. The reversal of 18776839349 is 94393867781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94393867781 = 457 ⋅206551133.

It can be written as a sum of positive squares in 2 ways, for example, as 60684100 + 18716155249 = 7790^2 + 136807^2 .

It is a cyclic number.

It is not a de Polignac number, because 18776839349 - 2²⁴ = 18760062133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18776839309) 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, 9266924 + ... + 9268949.

It is an arithmetic number, because the mean of its divisors is an integer number (4698844059).

Almost surely, 2^18776839349 is an apocalyptic number.

It is an amenable number.

18776839349 is a deficient number, since it is larger than the sum of its proper divisors (18536887).

18776839349 is a wasteful number, since it uses less digits than its factorization.

18776839349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18536886.

The product of its digits is 54867456, while the sum is 65.

The spelling of 18776839349 in words is "eighteen billion, seven hundred seventy-six million, eight hundred thirty-nine thousand, three hundred forty-nine".