165851043 has 16 divisors (see below), whose sum is σ = 226676736. Its totient is φ = 107805600.

The previous prime is 165851039. The next prime is 165851051. The reversal of 165851043 is 340158561.

It is not a de Polignac number, because 165851043 - 2² = 165851039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165850995 and 165851013.

It is not an unprimeable number, because it can be changed into a prime (165851083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143518 + ... + 144668.

It is an arithmetic number, because the mean of its divisors is an integer number (14167296).

Almost surely, 2^165851043 is an apocalyptic number.

165851043 is a deficient number, since it is larger than the sum of its proper divisors (60825693).

165851043 is a wasteful number, since it uses less digits than its factorization.

165851043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 165851043 is about 12878.3167766599. The cubic root of 165851043 is about 549.4220297645.

The spelling of 165851043 in words is "one hundred sixty-five million, eight hundred fifty-one thousand, forty-three".