66338077 has 18 divisors (see below), whose sum is σ = 74498202. Its totient is φ = 59001696.

The previous prime is 66338071. The next prime is 66338081. The reversal of 66338077 is 77083366.

It can be written as a sum of positive squares in 3 ways, for example, as 3437316 + 62900761 = 1854^2 + 7931^2 .

It is not a de Polignac number, because 66338077 - 2¹¹ = 66336029 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 (66338071) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 644008 + ... + 644110.

It is an arithmetic number, because the mean of its divisors is an integer number (4138789).

Almost surely, 2^66338077 is an apocalyptic number.

It is an amenable number.

66338077 is a deficient number, since it is larger than the sum of its proper divisors (8160125).

66338077 is a wasteful number, since it uses less digits than its factorization.

66338077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 66338077 is about 8144.8190280693. The cubic root of 66338077 is about 404.8128526184.

The spelling of 66338077 in words is "sixty-six million, three hundred thirty-eight thousand, seventy-seven".