66747568 has 20 divisors (see below), whose sum is σ = 129717640. Its totient is φ = 33272064.

The previous prime is 66747547. The next prime is 66747581. The reversal of 66747568 is 86574766.

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, 798 + ... + 11581.

It is an arithmetic number, because the mean of its divisors is an integer number (6485882).

Almost surely, 2^66747568 is an apocalyptic number.

It is an amenable number.

66747568 is a deficient number, since it is larger than the sum of its proper divisors (62970072).

66747568 is a wasteful number, since it uses less digits than its factorization.

66747568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12724 (or 12718 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 49.

The square root of 66747568 is about 8169.9184818455. The cubic root of 66747568 is about 405.6440861530.

The spelling of 66747568 in words is "sixty-six million, seven hundred forty-seven thousand, five hundred sixty-eight".