18199138077 has 20 divisors (see below), whose sum is σ = 27193558876. Its totient is φ = 12129549120.

The previous prime is 18199138073. The next prime is 18199138093. The reversal of 18199138077 is 77083199181.

18199138077 is a `hidden beast` number, since 1 + 8 + 199 + 1 + 380 + 77 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14126273316 + 4072864761 = 118854^2 + 63819^2 .

It is not a de Polignac number, because 18199138077 - 2² = 18199138073 is a prime.

It is a super-2 number, since 2×18199138077² (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 (18199138073) 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 19 ways as a sum of consecutive naturals, for example, 300927 + ... + 356307.

Almost surely, 2^18199138077 is an apocalyptic number.

It is an amenable number.

18199138077 is a deficient number, since it is larger than the sum of its proper divisors (8994420799).

18199138077 is an equidigital number, since it uses as much as digits as its factorization.

18199138077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59450 (or 59441 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 54.

The spelling of 18199138077 in words is "eighteen billion, one hundred ninety-nine million, one hundred thirty-eight thousand, seventy-seven".