18135632177 has 12 divisors (see below), whose sum is σ = 20168755740. Its totient is φ = 16288129728.

The previous prime is 18135632173. The next prime is 18135632233. The reversal of 18135632177 is 77123653181.

It can be written as a sum of positive squares in 6 ways, for example, as 893053456 + 17242578721 = 29884^2 + 131311^2 .

It is not a de Polignac number, because 18135632177 - 2² = 18135632173 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18135632173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1443902 + ... + 1456407.

It is an arithmetic number, because the mean of its divisors is an integer number (1680729645).

Almost surely, 2^18135632177 is an apocalyptic number.

It is an amenable number.

18135632177 is a deficient number, since it is larger than the sum of its proper divisors (2033123563).

18135632177 is a wasteful number, since it uses less digits than its factorization.

18135632177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900372 (or 2900359 counting only the distinct ones).

The product of its digits is 211680, while the sum is 44.

The spelling of 18135632177 in words is "eighteen billion, one hundred thirty-five million, six hundred thirty-two thousand, one hundred seventy-seven".