66856480 has 48 divisors (see below), whose sum is σ = 158505984. Its totient is φ = 26648320.

The previous prime is 66856399. The next prime is 66856507. The reversal of 66856480 is 8465866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60735 + ... + 61825.

It is an arithmetic number, because the mean of its divisors is an integer number (3302208).

Almost surely, 2^66856480 is an apocalyptic number.

It is an amenable number.

66856480 is an abundant number, since it is smaller than the sum of its proper divisors (91649504).

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

66856480 is a wasteful number, since it uses less digits than its factorization.

66856480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489 (or 1481 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 66856480 is about 8176.5811926501. The cubic root of 66856480 is about 405.8645960660.

The spelling of 66856480 in words is "sixty-six million, eight hundred fifty-six thousand, four hundred eighty".