66740443 has 8 divisors (see below), whose sum is σ = 83208960. Its totient is φ = 52005480.

The previous prime is 66740437. The next prime is 66740519. The reversal of 66740443 is 34404766.

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 66740443 - 2¹⁷ = 66609371 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66740399 and 66740408.

It is not an unprimeable number, because it can be changed into a prime (66740413) 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, 433303 + ... + 433456.

It is an arithmetic number, because the mean of its divisors is an integer number (10401120).

Almost surely, 2^66740443 is an apocalyptic number.

66740443 is a deficient number, since it is larger than the sum of its proper divisors (16468517).

66740443 is a wasteful number, since it uses less digits than its factorization.

66740443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866777.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 66740443 is about 8169.4824193458. The cubic root of 66740443 is about 405.6296520842.

The spelling of 66740443 in words is "sixty-six million, seven hundred forty thousand, four hundred forty-three".