66042056 has 8 divisors (see below), whose sum is σ = 123828870. Its totient is φ = 33021024.

The previous prime is 66042049. The next prime is 66042073. The reversal of 66042056 is 65024066.

It can be written as a sum of positive squares in only one way, i.e., 49477156 + 16564900 = 7034^2 + 4070^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4127621 + ... + 4127636.

Almost surely, 2^66042056 is an apocalyptic number.

It is an amenable number.

66042056 is a deficient number, since it is larger than the sum of its proper divisors (57786814).

66042056 is a wasteful number, since it uses less digits than its factorization.

66042056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8255263 (or 8255259 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66042056 is about 8126.6263603047. The cubic root of 66042056 is about 404.2098214073.

The spelling of 66042056 in words is "sixty-six million, forty-two thousand, fifty-six", and thus it is an eban number.