66746868 has 12 divisors (see below), whose sum is σ = 155742720. Its totient is φ = 22248952.

The previous prime is 66746839. The next prime is 66746881. The reversal of 66746868 is 86864766.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 66746868.

It is a congruent number.

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, 2781108 + ... + 2781131.

It is an arithmetic number, because the mean of its divisors is an integer number (12978560).

Almost surely, 2^66746868 is an apocalyptic number.

It is an amenable number.

66746868 is an abundant number, since it is smaller than the sum of its proper divisors (88995852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66746868 is a wasteful number, since it uses less digits than its factorization.

66746868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5562246 (or 5562244 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 51.

The square root of 66746868 is about 8169.8756416484. The cubic root of 66746868 is about 405.6426681145.

The spelling of 66746868 in words is "sixty-six million, seven hundred forty-six thousand, eight hundred sixty-eight".