66746747 has 4 divisors (see below), whose sum is σ = 67661160. Its totient is φ = 65832336.

The previous prime is 66746741. The next prime is 66746761. The reversal of 66746747 is 74764766.

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 66746747 - 2⁴ = 66746731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66746741) 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, 457097 + ... + 457242.

It is an arithmetic number, because the mean of its divisors is an integer number (16915290).

Almost surely, 2^66746747 is an apocalyptic number.

66746747 is a deficient number, since it is larger than the sum of its proper divisors (914413).

66746747 is an equidigital number, since it uses as much as digits as its factorization.

66746747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914412.

The product of its digits is 1185408, while the sum is 47.

The square root of 66746747 is about 8169.8682363916. The cubic root of 66746747 is about 405.6424229955.

The spelling of 66746747 in words is "sixty-six million, seven hundred forty-six thousand, seven hundred forty-seven".