66057309 has 8 divisors (see below), whose sum is σ = 97862720. Its totient is φ = 44038188.

The previous prime is 66057307. The next prime is 66057317. The reversal of 66057309 is 90375066.

It is a happy number.

It is not a de Polignac number, because 66057309 - 2¹ = 66057307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66057307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1223257 + ... + 1223310.

It is an arithmetic number, because the mean of its divisors is an integer number (12232840).

Almost surely, 2^66057309 is an apocalyptic number.

It is an amenable number.

66057309 is a deficient number, since it is larger than the sum of its proper divisors (31805411).

66057309 is a wasteful number, since it uses less digits than its factorization.

66057309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446576 (or 2446570 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 66057309 is about 8127.5647644297. The cubic root of 66057309 is about 404.2409376292.

It can be divided in two parts, 66057 and 309, that added together give a palindrome (66366).

The spelling of 66057309 in words is "sixty-six million, fifty-seven thousand, three hundred nine".