18818849677 has 4 divisors (see below), whose sum is σ = 19425909376. Its totient is φ = 18211789980.

The previous prime is 18818849659. The next prime is 18818849701. The reversal of 18818849677 is 77694881881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18818849677 - 2³¹ = 16671366029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18818849977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303529803 + ... + 303529864.

It is an arithmetic number, because the mean of its divisors is an integer number (4856477344).

Almost surely, 2^18818849677 is an apocalyptic number.

It is an amenable number.

18818849677 is a deficient number, since it is larger than the sum of its proper divisors (607059699).

18818849677 is an equidigital number, since it uses as much as digits as its factorization.

18818849677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607059698.

The product of its digits is 43352064, while the sum is 67.

The spelling of 18818849677 in words is "eighteen billion, eight hundred eighteen million, eight hundred forty-nine thousand, six hundred seventy-seven".