66607943 has 4 divisors (see below), whose sum is σ = 66894048. Its totient is φ = 66321840.

The previous prime is 66607907. The next prime is 66607949. The reversal of 66607943 is 34970666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66607943 - 2¹⁴ = 66591559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66607943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66607949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142703 + ... + 143168.

It is an arithmetic number, because the mean of its divisors is an integer number (16723512).

Almost surely, 2^66607943 is an apocalyptic number.

66607943 is a deficient number, since it is larger than the sum of its proper divisors (286105).

66607943 is a wasteful number, since it uses less digits than its factorization.

66607943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286104.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 66607943 is about 8161.3689415441. The cubic root of 66607943 is about 405.3610416631.

The spelling of 66607943 in words is "sixty-six million, six hundred seven thousand, nine hundred forty-three".