18606677549 has 4 divisors (see below), whose sum is σ = 19109560764. Its totient is φ = 18103794336.

The previous prime is 18606677527. The next prime is 18606677597. The reversal of 18606677549 is 94577660681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94577660681 = 7 ⋅13511094383.

It can be written as a sum of positive squares in 2 ways, for example, as 15707608900 + 2899068649 = 125330^2 + 53843^2 .

It is a cyclic number.

It is not a de Polignac number, because 18606677549 - 2²⁰ = 18605628973 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 (18606667549) 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, 251441552 + ... + 251441625.

It is an arithmetic number, because the mean of its divisors is an integer number (4777390191).

Almost surely, 2^18606677549 is an apocalyptic number.

It is an amenable number.

18606677549 is a deficient number, since it is larger than the sum of its proper divisors (502883215).

18606677549 is an equidigital number, since it uses as much as digits as its factorization.

18606677549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502883214.

The product of its (nonzero) digits is 15240960, while the sum is 59.

The spelling of 18606677549 in words is "eighteen billion, six hundred six million, six hundred seventy-seven thousand, five hundred forty-nine".