18089748777 has 4 divisors (see below), whose sum is σ = 24119665040. Its totient is φ = 12059832516.

The previous prime is 18089748767. The next prime is 18089748797. The reversal of 18089748777 is 77784798081.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77784798081 = 3 ⋅25928266027.

It is a de Polignac number, because none of the positive numbers 2^k-18089748777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18089748707) 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, 3014958127 + ... + 3014958132.

It is an arithmetic number, because the mean of its divisors is an integer number (6029916260).

Almost surely, 2^18089748777 is an apocalyptic number.

It is an amenable number.

18089748777 is a deficient number, since it is larger than the sum of its proper divisors (6029916263).

18089748777 is an equidigital number, since it uses as much as digits as its factorization.

18089748777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6029916262.

The product of its (nonzero) digits is 44255232, while the sum is 66.

The spelling of 18089748777 in words is "eighteen billion, eighty-nine million, seven hundred forty-eight thousand, seven hundred seventy-seven".