165861534 has 8 divisors (see below), whose sum is σ = 331723080. Its totient is φ = 55287176.

The previous prime is 165861511. The next prime is 165861541. The reversal of 165861534 is 435168561.

It is a sphenic number, since it is the product of 3 distinct primes.

165861534 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 165861492 and 165861501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13821789 + ... + 13821800.

It is an arithmetic number, because the mean of its divisors is an integer number (41465385).

Almost surely, 2^165861534 is an apocalyptic number.

165861534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165861534 is a wasteful number, since it uses less digits than its factorization.

165861534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27643594.

The product of its digits is 86400, while the sum is 39.

The square root of 165861534 is about 12878.7240827653. The cubic root of 165861534 is about 549.4336141856.

The spelling of 165861534 in words is "one hundred sixty-five million, eight hundred sixty-one thousand, five hundred thirty-four".