66380569 has 4 divisors (see below), whose sum is σ = 66486400. Its totient is φ = 66274740.

The previous prime is 66380491. The next prime is 66380593. The reversal of 66380569 is 96508366.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96508366 = 2 ⋅48254183.

It is a cyclic number.

It is not a de Polignac number, because 66380569 - 2⁷ = 66380441 is a prime.

It is a super-2 number, since 2×66380569² = 8812759881527522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66380969) 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, 51969 + ... + 53230.

It is an arithmetic number, because the mean of its divisors is an integer number (16621600).

Almost surely, 2^66380569 is an apocalyptic number.

It is an amenable number.

66380569 is a deficient number, since it is larger than the sum of its proper divisors (105831).

66380569 is a wasteful number, since it uses less digits than its factorization.

66380569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105830.

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

The square root of 66380569 is about 8147.4271399013. The cubic root of 66380569 is about 404.8992667219.

The spelling of 66380569 in words is "sixty-six million, three hundred eighty thousand, five hundred sixty-nine".