66076993 has 4 divisors (see below), whose sum is σ = 68355540. Its totient is φ = 63798448.

The previous prime is 66076987. The next prime is 66077017. The reversal of 66076993 is 39967066.

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 26286129 + 39790864 = 5127^2 + 6308^2 .

It is a cyclic number.

It is not a de Polignac number, because 66076993 - 2¹⁷ = 65945921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66076973) 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, 1139230 + ... + 1139287.

It is an arithmetic number, because the mean of its divisors is an integer number (17088885).

Almost surely, 2^66076993 is an apocalyptic number.

It is an amenable number.

66076993 is a deficient number, since it is larger than the sum of its proper divisors (2278547).

66076993 is a wasteful number, since it uses less digits than its factorization.

66076993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278546.

The product of its (nonzero) digits is 367416, while the sum is 46.

The square root of 66076993 is about 8128.7756150604. The cubic root of 66076993 is about 404.2810860423.

The spelling of 66076993 in words is "sixty-six million, seventy-six thousand, nine hundred ninety-three".