66665299 has 4 divisors (see below), whose sum is σ = 66711736. Its totient is φ = 66618864.

The previous prime is 66665273. The next prime is 66665311. The reversal of 66665299 is 99256666.

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 66665299 - 2¹⁷ = 66534227 is a prime.

It is a super-4 number, since 4×66665299⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66665399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20994 + ... + 23959.

It is an arithmetic number, because the mean of its divisors is an integer number (16677934).

Almost surely, 2^66665299 is an apocalyptic number.

66665299 is a deficient number, since it is larger than the sum of its proper divisors (46437).

66665299 is a wasteful number, since it uses less digits than its factorization.

66665299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46436.

The product of its digits is 1049760, while the sum is 49.

The square root of 66665299 is about 8164.8820567109. The cubic root of 66665299 is about 405.4773602110.

The spelling of 66665299 in words is "sixty-six million, six hundred sixty-five thousand, two hundred ninety-nine".