66840341 has 4 divisors (see below), whose sum is σ = 66940332. Its totient is φ = 66740352.

The previous prime is 66840337. The next prime is 66840343. The reversal of 66840341 is 14304866.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16728100 + 50112241 = 4090^2 + 7079^2 .

It is a cyclic number.

It is not a de Polignac number, because 66840341 - 2² = 66840337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66840298 and 66840307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66840343) 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, 48986 + ... + 50331.

It is an arithmetic number, because the mean of its divisors is an integer number (16735083).

Almost surely, 2^66840341 is an apocalyptic number.

It is an amenable number.

66840341 is a deficient number, since it is larger than the sum of its proper divisors (99991).

66840341 is an equidigital number, since it uses as much as digits as its factorization.

66840341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99990.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 66840341 is about 8175.5942291677. The cubic root of 66840341 is about 405.8319351788.

The spelling of 66840341 in words is "sixty-six million, eight hundred forty thousand, three hundred forty-one".