66204243 has 48 divisors (see below), whose sum is σ = 115167360. Its totient is φ = 37476432.

The previous prime is 66204221. The next prime is 66204263. The reversal of 66204243 is 34240266.

It is not a de Polignac number, because 66204243 - 2⁶ = 66204179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (66204263) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 215496 + ... + 215802.

It is an arithmetic number, because the mean of its divisors is an integer number (2399320).

Almost surely, 2^66204243 is an apocalyptic number.

66204243 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

66204243 is a deficient number, since it is larger than the sum of its proper divisors (48963117).

66204243 is a wasteful number, since it uses less digits than its factorization.

66204243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 66204243 is about 8136.5989823759. The cubic root of 66204243 is about 404.5404389442.

The spelling of 66204243 in words is "sixty-six million, two hundred four thousand, two hundred forty-three".