66740746 has 4 divisors (see below), whose sum is σ = 100111122. Its totient is φ = 33370372.

The previous prime is 66740719. The next prime is 66740747. The reversal of 66740746 is 64704766.

66740746 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 1535121 = 8075^2 + 1239^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66740699 and 66740708.

It is not an unprimeable number, because it can be changed into a prime (66740747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16685185 + ... + 16685188.

Almost surely, 2^66740746 is an apocalyptic number.

66740746 is a deficient number, since it is larger than the sum of its proper divisors (33370376).

66740746 is a wasteful number, since it uses less digits than its factorization.

66740746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33370375.

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 66740746 is about 8169.5009639512. The cubic root of 66740746 is about 405.6302659329.

The spelling of 66740746 in words is "sixty-six million, seven hundred forty thousand, seven hundred forty-six".