165151643 has 4 divisors (see below), whose sum is σ = 165177840. Its totient is φ = 165125448.

The previous prime is 165151631. The next prime is 165151697. The reversal of 165151643 is 346151561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 165151643 - 2⁴ = 165151627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165151543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2753 + ... + 18381.

It is an arithmetic number, because the mean of its divisors is an integer number (41294460).

Almost surely, 2^165151643 is an apocalyptic number.

165151643 is a deficient number, since it is larger than the sum of its proper divisors (26197).

165151643 is a wasteful number, since it uses less digits than its factorization.

165151643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26196.

The product of its digits is 10800, while the sum is 32.

The square root of 165151643 is about 12851.1339188416. The cubic root of 165151643 is about 548.6486305663.

The spelling of 165151643 in words is "one hundred sixty-five million, one hundred fifty-one thousand, six hundred forty-three".