18077320511 has 4 divisors (see below), whose sum is σ = 18863290992. Its totient is φ = 17291350032.

The previous prime is 18077320483. The next prime is 18077320531. The reversal of 18077320511 is 11502377081.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18077320511 - 2¹⁸ = 18077058367 is a prime.

It is a super-2 number, since 2×18077320511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18077320531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392985206 + ... + 392985251.

It is an arithmetic number, because the mean of its divisors is an integer number (4715822748).

Almost surely, 2^18077320511 is an apocalyptic number.

18077320511 is a deficient number, since it is larger than the sum of its proper divisors (785970481).

18077320511 is an equidigital number, since it uses as much as digits as its factorization.

18077320511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785970480.

The product of its (nonzero) digits is 11760, while the sum is 35.

Adding to 18077320511 its reverse (11502377081), we get a palindrome (29579697592).

The spelling of 18077320511 in words is "eighteen billion, seventy-seven million, three hundred twenty thousand, five hundred eleven".