66481656 has 32 divisors (see below), whose sum is σ = 166654800. Its totient is φ = 22100480.

The previous prime is 66481633. The next prime is 66481691. The reversal of 66481656 is 65618466.

It is a congruent number.

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, 5776 + ... + 12896.

Almost surely, 2^66481656 is an apocalyptic number.

It is an amenable number.

66481656 is an abundant number, since it is smaller than the sum of its proper divisors (100173144).

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

66481656 is a wasteful number, since it uses less digits than its factorization.

66481656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7519 (or 7515 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 66481656 is about 8153.6283947700. The cubic root of 66481656 is about 405.1046947747.

The spelling of 66481656 in words is "sixty-six million, four hundred eighty-one thousand, six hundred fifty-six".