18674424877 has 4 divisors (see below), whose sum is σ = 19772920476. Its totient is φ = 17575929280.

The previous prime is 18674424859. The next prime is 18674424889. The reversal of 18674424877 is 77842447681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15829162596 + 2845262281 = 125814^2 + 53341^2 .

It is a cyclic number.

It is not a de Polignac number, because 18674424877 - 2²³ = 18666036269 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18674424077) 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, 549247774 + ... + 549247807.

It is an arithmetic number, because the mean of its divisors is an integer number (4943230119).

Almost surely, 2^18674424877 is an apocalyptic number.

18674424877 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18674424877 is a deficient number, since it is larger than the sum of its proper divisors (1098495599).

18674424877 is a wasteful number, since it uses less digits than its factorization.

18674424877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098495598.

The product of its digits is 16859136, while the sum is 58.

The spelling of 18674424877 in words is "eighteen billion, six hundred seventy-four million, four hundred twenty-four thousand, eight hundred seventy-seven".