66768256 has 32 divisors (see below), whose sum is σ = 133477200. Its totient is φ = 33268224.

The previous prime is 66768227. The next prime is 66768257. The reversal of 66768256 is 65286766.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66768257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45226 + ... + 46678.

Almost surely, 2^66768256 is an apocalyptic number.

It is an amenable number.

66768256 is a deficient number, since it is larger than the sum of its proper divisors (66708944).

66768256 is a wasteful number, since it uses less digits than its factorization.

66768256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826 (or 1814 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The square root of 66768256 is about 8171.1844918592. The cubic root of 66768256 is about 405.6859907908.

The spelling of 66768256 in words is "sixty-six million, seven hundred sixty-eight thousand, two hundred fifty-six".