165756213 has 40 divisors (see below), whose sum is σ = 284259008. Its totient is φ = 94291776.

The previous prime is 165756131. The next prime is 165756223. The reversal of 165756213 is 312657561.

165756213 is a `hidden beast` number, since 16 + 575 + 62 + 13 = 666.

It is not a de Polignac number, because 165756213 - 2¹⁴ = 165739829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165756223) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 159945 + ... + 160977.

Almost surely, 2^165756213 is an apocalyptic number.

It is an amenable number.

165756213 is a deficient number, since it is larger than the sum of its proper divisors (118502795).

165756213 is a wasteful number, since it uses less digits than its factorization.

165756213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 1326 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 165756213 is about 12874.6344802484. The cubic root of 165756213 is about 549.3172939656.

The spelling of 165756213 in words is "one hundred sixty-five million, seven hundred fifty-six thousand, two hundred thirteen".