66740668 has 6 divisors (see below), whose sum is σ = 116796176. Its totient is φ = 33370332.

The previous prime is 66740633. The next prime is 66740669. The reversal of 66740668 is 86604766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66740669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342580 + ... + 8342587.

Almost surely, 2^66740668 is an apocalyptic number.

It is an amenable number.

66740668 is a deficient number, since it is larger than the sum of its proper divisors (50055508).

66740668 is a wasteful number, since it uses less digits than its factorization.

66740668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16685171 (or 16685169 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 66740668 is about 8169.4961900964. The cubic root of 66740668 is about 405.6301079126.

The spelling of 66740668 in words is "sixty-six million, seven hundred forty thousand, six hundred sixty-eight".