66243869 has 8 divisors (see below), whose sum is σ = 68674560. Its totient is φ = 63831600.

The previous prime is 66243847. The next prime is 66243871. The reversal of 66243869 is 96834266.

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 66243869 - 2⁸ = 66243613 is a prime.

It is a super-2 number, since 2×66243869² = 8776500360178322, 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 (66243809) 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, 2939 + ... + 11879.

It is an arithmetic number, because the mean of its divisors is an integer number (8584320).

Almost surely, 2^66243869 is an apocalyptic number.

It is an amenable number.

66243869 is a deficient number, since it is larger than the sum of its proper divisors (2430691).

66243869 is a wasteful number, since it uses less digits than its factorization.

66243869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9211.

The product of its digits is 373248, while the sum is 44.

The square root of 66243869 is about 8139.0336649998. The cubic root of 66243869 is about 404.6211342869.

The spelling of 66243869 in words is "sixty-six million, two hundred forty-three thousand, eight hundred sixty-nine".