165812557743 has 48 divisors (see below), whose sum is σ = 287274723840. Its totient is φ = 90106454592.

The previous prime is 165812557721. The next prime is 165812557751. The reversal of 165812557743 is 347755218561.

165812557743 is a `hidden beast` number, since 1 + 6 + 5 + 8 + 1 + 25 + 577 + 43 = 666.

It is not a de Polignac number, because 165812557743 - 2²² = 165808363439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165812557743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165812557753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 80053 + ... + 581406.

It is an arithmetic number, because the mean of its divisors is an integer number (5984890080).

Almost surely, 2^165812557743 is an apocalyptic number.

165812557743 is a deficient number, since it is larger than the sum of its proper divisors (121462166097).

165812557743 is a wasteful number, since it uses less digits than its factorization.

165812557743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661668 (or 661665 counting only the distinct ones).

The product of its digits is 7056000, while the sum is 54.

The spelling of 165812557743 in words is "one hundred sixty-five billion, eight hundred twelve million, five hundred fifty-seven thousand, seven hundred forty-three".