66764185 has 8 divisors (see below), whose sum is σ = 84829896. Its totient is φ = 50269440.

The previous prime is 66764179. The next prime is 66764189. The reversal of 66764185 is 58146766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25765776 + 40998409 = 5076^2 + 6403^2 .

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

It is not a de Polignac number, because 66764185 - 2¹⁷ = 66633113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66764189) 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, 392646 + ... + 392815.

It is an arithmetic number, because the mean of its divisors is an integer number (10603737).

Almost surely, 2^66764185 is an apocalyptic number.

It is an amenable number.

66764185 is a deficient number, since it is larger than the sum of its proper divisors (18065711).

66764185 is a wasteful number, since it uses less digits than its factorization.

66764185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785483.

The product of its digits is 241920, while the sum is 43.

The square root of 66764185 is about 8170.9353809708. The cubic root of 66764185 is about 405.6777454492.

The spelling of 66764185 in words is "sixty-six million, seven hundred sixty-four thousand, one hundred eighty-five".