165881134287 has 12 divisors (see below), whose sum is σ = 261388454184. Its totient is φ = 100534020720.

The previous prime is 165881134273. The next prime is 165881134297. The reversal of 165881134287 is 782431188561.

165881134287 is a `hidden beast` number, since 1 + 6 + 588 + 1 + 1 + 34 + 28 + 7 = 666.

It is not a de Polignac number, because 165881134287 - 2⁸ = 165881134031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165881134297) 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, 837783408 + ... + 837783605.

It is an arithmetic number, because the mean of its divisors is an integer number (21782371182).

Almost surely, 2^165881134287 is an apocalyptic number.

165881134287 is a deficient number, since it is larger than the sum of its proper divisors (95507319897).

165881134287 is a wasteful number, since it uses less digits than its factorization.

165881134287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675567030 (or 1675567027 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The spelling of 165881134287 in words is "one hundred sixty-five billion, eight hundred eighty-one million, one hundred thirty-four thousand, two hundred eighty-seven".