66269669 has 4 divisors (see below), whose sum is σ = 68554860. Its totient is φ = 63984480.

The previous prime is 66269659. The next prime is 66269677. The reversal of 66269669 is 96696266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40157569 + 26112100 = 6337^2 + 5110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66269669 is a prime.

It is a super-2 number, since 2×66269669² = 8783338058739122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66269629) 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, 1142552 + ... + 1142609.

It is an arithmetic number, because the mean of its divisors is an integer number (17138715).

Almost surely, 2^66269669 is an apocalyptic number.

It is an amenable number.

66269669 is a deficient number, since it is larger than the sum of its proper divisors (2285191).

66269669 is a wasteful number, since it uses less digits than its factorization.

66269669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285190.

The product of its digits is 1259712, while the sum is 50.

The square root of 66269669 is about 8140.6184654484. The cubic root of 66269669 is about 404.6736567339.

The spelling of 66269669 in words is "sixty-six million, two hundred sixty-nine thousand, six hundred sixty-nine".