66161943 has 24 divisors (see below), whose sum is σ = 101992176. Its totient is φ = 41184000.

The previous prime is 66161941. The next prime is 66161983. The reversal of 66161943 is 34916166.

It is not a de Polignac number, because 66161943 - 2¹ = 66161941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66161898 and 66161907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66161941) 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, 18393 + ... + 21693.

It is an arithmetic number, because the mean of its divisors is an integer number (4249674).

Almost surely, 2^66161943 is an apocalyptic number.

66161943 is a deficient number, since it is larger than the sum of its proper divisors (35830233).

66161943 is a wasteful number, since it uses less digits than its factorization.

66161943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3455 (or 3452 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 66161943 is about 8133.9992008851. Note that the first 3 decimals coincide. The cubic root of 66161943 is about 404.4542626632.

The spelling of 66161943 in words is "sixty-six million, one hundred sixty-one thousand, nine hundred forty-three".