66648593 has 4 divisors (see below), whose sum is σ = 72707568. Its totient is φ = 60589620.

The previous prime is 66648577. The next prime is 66648601. The reversal of 66648593 is 39584666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66648593 - 2⁴ = 66648577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66648553) 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, 3029471 + ... + 3029492.

It is an arithmetic number, because the mean of its divisors is an integer number (18176892).

Almost surely, 2^66648593 is an apocalyptic number.

It is an amenable number.

66648593 is a deficient number, since it is larger than the sum of its proper divisors (6058975).

66648593 is a wasteful number, since it uses less digits than its factorization.

66648593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6058974.

The product of its digits is 933120, while the sum is 47.

The square root of 66648593 is about 8163.8589527257. The cubic root of 66648593 is about 405.4434871626.

The spelling of 66648593 in words is "sixty-six million, six hundred forty-eight thousand, five hundred ninety-three".