18157711877 has 4 divisors (see below), whose sum is σ = 18202993356. Its totient is φ = 18112430400.

The previous prime is 18157711837. The next prime is 18157711889. The reversal of 18157711877 is 77811775181.

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 12284175556 + 5873536321 = 110834^2 + 76639^2 .

It is a cyclic number.

It is not a de Polignac number, because 18157711877 - 2¹⁰ = 18157710853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18157711837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22640138 + ... + 22640939.

It is an arithmetic number, because the mean of its divisors is an integer number (4550748339).

Almost surely, 2^18157711877 is an apocalyptic number.

It is an amenable number.

18157711877 is a deficient number, since it is larger than the sum of its proper divisors (45281479).

18157711877 is an equidigital number, since it uses as much as digits as its factorization.

18157711877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45281478.

The product of its digits is 768320, while the sum is 53.

The spelling of 18157711877 in words is "eighteen billion, one hundred fifty-seven million, seven hundred eleven thousand, eight hundred seventy-seven".