66065893 has 4 divisors (see below), whose sum is σ = 69952140. Its totient is φ = 62179648.

The previous prime is 66065891. The next prime is 66065897. The reversal of 66065893 is 39856066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39856066 = 2 ⋅19928033.

It can be written as a sum of positive squares in 2 ways, for example, as 60949249 + 5116644 = 7807^2 + 2262^2 .

It is a cyclic number.

It is not a de Polignac number, because 66065893 - 2¹ = 66065891 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 (66065891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943098 + ... + 1943131.

It is an arithmetic number, because the mean of its divisors is an integer number (17488035).

Almost surely, 2^66065893 is an apocalyptic number.

It is an amenable number.

66065893 is a deficient number, since it is larger than the sum of its proper divisors (3886247).

66065893 is a wasteful number, since it uses less digits than its factorization.

66065893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886246.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 66065893 is about 8128.0928267337. The cubic root of 66065893 is about 404.2584469403.

The spelling of 66065893 in words is "sixty-six million, sixty-five thousand, eight hundred ninety-three".