165943953 has 24 divisors (see below), whose sum is σ = 290055168. Its totient is φ = 89246592.

The previous prime is 165943951. The next prime is 165943963. The reversal of 165943953 is 359349561.

165943953 is a `hidden beast` number, since 1 + 6 + 594 + 3 + 9 + 53 = 666.

It is not a de Polignac number, because 165943953 - 2¹ = 165943951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165943899 and 165943908.

It is not an unprimeable number, because it can be changed into a prime (165943951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76401 + ... + 78542.

It is an arithmetic number, because the mean of its divisors is an integer number (12085632).

Almost surely, 2^165943953 is an apocalyptic number.

It is an amenable number.

165943953 is a deficient number, since it is larger than the sum of its proper divisors (124111215).

165943953 is a wasteful number, since it uses less digits than its factorization.

165943953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154973 (or 154970 counting only the distinct ones).

The product of its digits is 437400, while the sum is 45.

The square root of 165943953 is about 12881.9234976769. The cubic root of 165943953 is about 549.5246062907.

The spelling of 165943953 in words is "one hundred sixty-five million, nine hundred forty-three thousand, nine hundred fifty-three".