66566056 has 16 divisors (see below), whose sum is σ = 126099540. Its totient is φ = 32939520.

The previous prime is 66566011. The next prime is 66566077. The reversal of 66566056 is 65066566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 63202500 + 3363556 = 7950^2 + 1834^2 .

It is a super-2 number, since 2×66566056² = 8862079622790272, which contains 22 as substring.

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, 42115 + ... + 43666.

Almost surely, 2^66566056 is an apocalyptic number.

It is an amenable number.

66566056 is a deficient number, since it is larger than the sum of its proper divisors (59533484).

66566056 is a wasteful number, since it uses less digits than its factorization.

66566056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85884 (or 85880 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 66566056 is about 8158.8023630923. The cubic root of 66566056 is about 405.2760522077.

The spelling of 66566056 in words is "sixty-six million, five hundred sixty-six thousand, fifty-six".