66763217 has 4 divisors (see below), whose sum is σ = 67703616. Its totient is φ = 65822820.

The previous prime is 66763163. The next prime is 66763231. The reversal of 66763217 is 71236766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66763217 - 2⁶ = 66763153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66763297) 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, 470093 + ... + 470234.

It is an arithmetic number, because the mean of its divisors is an integer number (16925904).

Almost surely, 2^66763217 is an apocalyptic number.

It is an amenable number.

66763217 is a deficient number, since it is larger than the sum of its proper divisors (940399).

66763217 is an equidigital number, since it uses as much as digits as its factorization.

66763217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940398.

The product of its digits is 63504, while the sum is 38.

The square root of 66763217 is about 8170.8761464117. The cubic root of 66763217 is about 405.6757848274.

The spelling of 66763217 in words is "sixty-six million, seven hundred sixty-three thousand, two hundred seventeen".