66377785 has 8 divisors (see below), whose sum is σ = 79697736. Its totient is φ = 53072640.

The previous prime is 66377777. The next prime is 66377797. The reversal of 66377785 is 58777366.

It can be written as a sum of positive squares in 4 ways, for example, as 4613904 + 61763881 = 2148^2 + 7859^2 .

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

It is not a de Polignac number, because 66377785 - 2³ = 66377777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13137 + ... + 17473.

It is an arithmetic number, because the mean of its divisors is an integer number (9962217).

Almost surely, 2^66377785 is an apocalyptic number.

It is an amenable number.

66377785 is a deficient number, since it is larger than the sum of its proper divisors (13319951).

66377785 is a wasteful number, since it uses less digits than its factorization.

66377785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7403.

The product of its digits is 1481760, while the sum is 49.

The square root of 66377785 is about 8147.2562866280. The cubic root of 66377785 is about 404.8936061532.

The spelling of 66377785 in words is "sixty-six million, three hundred seventy-seven thousand, seven hundred eighty-five".