66764063 has 4 divisors (see below), whose sum is σ = 67244520. Its totient is φ = 66283608.

The previous prime is 66764051. The next prime is 66764077. The reversal of 66764063 is 36046766.

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 66764063 - 2⁶ = 66763999 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 (66764023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240020 + ... + 240297.

It is an arithmetic number, because the mean of its divisors is an integer number (16811130).

Almost surely, 2^66764063 is an apocalyptic number.

66764063 is a deficient number, since it is larger than the sum of its proper divisors (480457).

66764063 is a wasteful number, since it uses less digits than its factorization.

66764063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480456.

The product of its (nonzero) digits is 108864, while the sum is 38.

The square root of 66764063 is about 8170.9279154818. The cubic root of 66764063 is about 405.6774983471.

The spelling of 66764063 in words is "sixty-six million, seven hundred sixty-four thousand, sixty-three".