66768263 has 4 divisors (see below), whose sum is σ = 66821040. Its totient is φ = 66715488.

The previous prime is 66768257. The next prime is 66768269. The reversal of 66768263 is 36286766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36286766 = 2 ⋅18143383.

It is an interprime number because it is at equal distance from previous prime (66768257) and next prime (66768269).

It is a cyclic number.

It is not a de Polignac number, because 66768263 - 2⁶ = 66768199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66768269) 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, 24443 + ... + 27036.

It is an arithmetic number, because the mean of its divisors is an integer number (16705260).

Almost surely, 2^66768263 is an apocalyptic number.

66768263 is a deficient number, since it is larger than the sum of its proper divisors (52777).

66768263 is a wasteful number, since it uses less digits than its factorization.

66768263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52776.

The product of its digits is 435456, while the sum is 44.

The square root of 66768263 is about 8171.1849201936. The cubic root of 66768263 is about 405.6860049682.

The spelling of 66768263 in words is "sixty-six million, seven hundred sixty-eight thousand, two hundred sixty-three".