66898307 has 4 divisors (see below), whose sum is σ = 76455216. Its totient is φ = 57341400.

The previous prime is 66898301. The next prime is 66898309. The reversal of 66898307 is 70389866.

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

It is a cyclic number.

It is not a de Polignac number, because 66898307 - 2⁴ = 66898291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66898301) 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, 4778444 + ... + 4778457.

It is an arithmetic number, because the mean of its divisors is an integer number (19113804).

Almost surely, 2^66898307 is an apocalyptic number.

66898307 is a deficient number, since it is larger than the sum of its proper divisors (9556909).

66898307 is an equidigital number, since it uses as much as digits as its factorization.

66898307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556908.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 66898307 is about 8179.1385243190. The cubic root of 66898307 is about 405.9492179280.

The spelling of 66898307 in words is "sixty-six million, eight hundred ninety-eight thousand, three hundred seven".