66743717 has 4 divisors (see below), whose sum is σ = 70669836. Its totient is φ = 62817600.

The previous prime is 66743701. The next prime is 66743737. The reversal of 66743717 is 71734766.

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 34093921 + 32649796 = 5839^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 66743717 - 2⁴ = 66743701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66743737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1963034 + ... + 1963067.

It is an arithmetic number, because the mean of its divisors is an integer number (17667459).

Almost surely, 2^66743717 is an apocalyptic number.

It is an amenable number.

66743717 is a deficient number, since it is larger than the sum of its proper divisors (3926119).

66743717 is a wasteful number, since it uses less digits than its factorization.

66743717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926118.

The product of its digits is 148176, while the sum is 41.

The square root of 66743717 is about 8169.6827967798. The cubic root of 66743717 is about 405.6362847930.

The spelling of 66743717 in words is "sixty-six million, seven hundred forty-three thousand, seven hundred seventeen".