66747656 has 16 divisors (see below), whose sum is σ = 130593600. Its totient is φ = 31922704.

The previous prime is 66747649. The next prime is 66747697. The reversal of 66747656 is 65674766.

It is a self number, because there is not a number n which added to its sum of digits gives 66747656.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181196 + ... + 181563.

It is an arithmetic number, because the mean of its divisors is an integer number (8162100).

Almost surely, 2^66747656 is an apocalyptic number.

It is an amenable number.

66747656 is a deficient number, since it is larger than the sum of its proper divisors (63845944).

66747656 is a wasteful number, since it uses less digits than its factorization.

66747656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362788 (or 362784 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 47.

The square root of 66747656 is about 8169.9238674543. The cubic root of 66747656 is about 405.6442644200.

The spelling of 66747656 in words is "sixty-six million, seven hundred forty-seven thousand, six hundred fifty-six".