66385562869 has 4 divisors (see below), whose sum is σ = 66452552320. Its totient is φ = 66318573420.

The previous prime is 66385562843. The next prime is 66385562909. The reversal of 66385562869 is 96826558366.

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 66385562869 - 2²¹ = 66383465717 is a prime.

It is a super-2 number, since 2×66385562869² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66385562869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66385562569) 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, 33493239 + ... + 33495220.

It is an arithmetic number, because the mean of its divisors is an integer number (16613138080).

Almost surely, 2^66385562869 is an apocalyptic number.

It is an amenable number.

66385562869 is a deficient number, since it is larger than the sum of its proper divisors (66989451).

66385562869 is an equidigital number, since it uses as much as digits as its factorization.

66385562869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66989450.

The product of its digits is 111974400, while the sum is 64.

The spelling of 66385562869 in words is "sixty-six billion, three hundred eighty-five million, five hundred sixty-two thousand, eight hundred sixty-nine".