66382657 has 12 divisors (see below), whose sum is σ = 74003328. Its totient is φ = 59490200.

The previous prime is 66382651. The next prime is 66382691. The reversal of 66382657 is 75628366.

It is not a de Polignac number, because 66382657 - 2¹⁹ = 65858369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66382651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4728 + ... + 12454.

It is an arithmetic number, because the mean of its divisors is an integer number (6166944).

Almost surely, 2^66382657 is an apocalyptic number.

It is an amenable number.

66382657 is a deficient number, since it is larger than the sum of its proper divisors (7620671).

66382657 is a wasteful number, since it uses less digits than its factorization.

66382657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7820 (or 7809 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The square root of 66382657 is about 8147.5552775050. Note that the first 3 decimals coincide. The cubic root of 66382657 is about 404.9035120446.

The spelling of 66382657 in words is "sixty-six million, three hundred eighty-two thousand, six hundred fifty-seven".