66999941 has 8 divisors (see below), whose sum is σ = 71066880. Its totient is φ = 62947008.

The previous prime is 66999923. The next prime is 66999953. The reversal of 66999941 is 14999966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66999941 - 2¹⁴ = 66983557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66999901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7340 + ... + 13706.

It is an arithmetic number, because the mean of its divisors is an integer number (8883360).

Almost surely, 2^66999941 is an apocalyptic number.

It is an amenable number.

66999941 is a deficient number, since it is larger than the sum of its proper divisors (4066939).

66999941 is a wasteful number, since it uses less digits than its factorization.

66999941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003.

The product of its digits is 944784, while the sum is 53.

The square root of 66999941 is about 8185.3491678730. The cubic root of 66999941 is about 406.1546908250.

The spelling of 66999941 in words is "sixty-six million, nine hundred ninety-nine thousand, nine hundred forty-one".