18853208377 has 4 divisors (see below), whose sum is σ = 18853484020. Its totient is φ = 18852932736.

The previous prime is 18853208291. The next prime is 18853208383. The reversal of 18853208377 is 77380235881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 77380235881 = 13 ⋅5952325837.

It can be written as a sum of positive squares in 2 ways, for example, as 8720571456 + 10132636921 = 93384^2 + 100661^2 .

It is a cyclic number.

It is not a de Polignac number, because 18853208377 - 2¹⁵ = 18853175609 is a prime.

It is a super-2 number, since 2×18853208377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18853208677) 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, 51073 + ... + 200785.

It is an arithmetic number, because the mean of its divisors is an integer number (4713371005).

Almost surely, 2^18853208377 is an apocalyptic number.

It is an amenable number.

18853208377 is a deficient number, since it is larger than the sum of its proper divisors (275643).

18853208377 is a wasteful number, since it uses less digits than its factorization.

18853208377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275642.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 18853208377 in words is "eighteen billion, eight hundred fifty-three million, two hundred eight thousand, three hundred seventy-seven".