66998315 has 4 divisors (see below), whose sum is σ = 80397984. Its totient is φ = 53598648.

The previous prime is 66998303. The next prime is 66998339. The reversal of 66998315 is 51389966.

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 66998315 - 2⁶ = 66998251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66998315.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6699827 + ... + 6699836.

It is an arithmetic number, because the mean of its divisors is an integer number (20099496).

Almost surely, 2^66998315 is an apocalyptic number.

66998315 is a deficient number, since it is larger than the sum of its proper divisors (13399669).

66998315 is a wasteful number, since it uses less digits than its factorization.

66998315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13399668.

The product of its digits is 349920, while the sum is 47.

The square root of 66998315 is about 8185.2498434684. The cubic root of 66998315 is about 406.1514051859.

The spelling of 66998315 in words is "sixty-six million, nine hundred ninety-eight thousand, three hundred fifteen".