66320069 has 8 divisors (see below), whose sum is σ = 67334520. Its totient is φ = 65313216.

The previous prime is 66320057. The next prime is 66320101. The reversal of 66320069 is 96002366.

It can be written as a sum of positive squares in 4 ways, for example, as 48469444 + 17850625 = 6962^2 + 4225^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66320069 - 2⁴ = 66320053 is a prime.

It is a super-2 number, since 2×66320069² = 8796703104329522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66320269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17099 + ... + 20615.

It is an arithmetic number, because the mean of its divisors is an integer number (8416815).

Almost surely, 2^66320069 is an apocalyptic number.

It is an amenable number.

66320069 is a deficient number, since it is larger than the sum of its proper divisors (1014451).

66320069 is a wasteful number, since it uses less digits than its factorization.

66320069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3799.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 66320069 is about 8143.7134649986. The cubic root of 66320069 is about 404.7762194111.

The spelling of 66320069 in words is "sixty-six million, three hundred twenty thousand, sixty-nine".