66194943 has 16 divisors (see below), whose sum is σ = 93613056. Its totient is φ = 41516640.

The previous prime is 66194939. The next prime is 66194977. The reversal of 66194943 is 34949166.

It is not a de Polignac number, because 66194943 - 2² = 66194939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66194895 and 66194904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66194543) 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, 3655 + ... + 12072.

It is an arithmetic number, because the mean of its divisors is an integer number (5850816).

Almost surely, 2^66194943 is an apocalyptic number.

66194943 is a deficient number, since it is larger than the sum of its proper divisors (27418113).

66194943 is a wasteful number, since it uses less digits than its factorization.

66194943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15814.

The product of its digits is 139968, while the sum is 42.

The square root of 66194943 is about 8136.0274704551. The cubic root of 66194943 is about 404.5214955347.

The spelling of 66194943 in words is "sixty-six million, one hundred ninety-four thousand, nine hundred forty-three".