165715643 has 8 divisors (see below), whose sum is σ = 177075360. Its totient is φ = 154535040.

The previous prime is 165715631. The next prime is 165715651. The reversal of 165715643 is 346517561.

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

It is a cyclic number.

It is not a de Polignac number, because 165715643 - 2⁶ = 165715579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165715597 and 165715606.

It is not an unprimeable number, because it can be changed into a prime (165711643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42863 + ... + 46568.

It is an arithmetic number, because the mean of its divisors is an integer number (22134420).

Almost surely, 2^165715643 is an apocalyptic number.

165715643 is a deficient number, since it is larger than the sum of its proper divisors (11359717).

165715643 is a wasteful number, since it uses less digits than its factorization.

165715643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89557.

The product of its digits is 75600, while the sum is 38.

The square root of 165715643 is about 12873.0588051170. The cubic root of 165715643 is about 549.2724738838.

The spelling of 165715643 in words is "one hundred sixty-five million, seven hundred fifteen thousand, six hundred forty-three".