18889077965 has 4 divisors (see below), whose sum is σ = 22666893564. Its totient is φ = 15111262368.

The previous prime is 18889077931. The next prime is 18889077983. The reversal of 18889077965 is 56977098881.

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 6851038441 + 12038039524 = 82771^2 + 109718^2 .

It is a cyclic number.

It is not a de Polignac number, because 18889077965 - 2⁸ = 18889077709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18889077895 and 18889077904.

It is a congruent number.

It is an unprimeable number.

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, 1888907792 + ... + 1888907801.

It is an arithmetic number, because the mean of its divisors is an integer number (5666723391).

Almost surely, 2^18889077965 is an apocalyptic number.

It is an amenable number.

18889077965 is a deficient number, since it is larger than the sum of its proper divisors (3777815599).

18889077965 is an equidigital number, since it uses as much as digits as its factorization.

18889077965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3777815598.

The product of its (nonzero) digits is 60963840, while the sum is 68.

The spelling of 18889077965 in words is "eighteen billion, eight hundred eighty-nine million, seventy-seven thousand, nine hundred sixty-five".