56666216 has 8 divisors (see below), whose sum is σ = 106249170. Its totient is φ = 28333104.

The previous prime is 56666191. The next prime is 56666221. The reversal of 56666216 is 61266665.

It can be written as a sum of positive squares in only one way, i.e., 30758116 + 25908100 = 5546^2 + 5090^2 .

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

It is a super-2 number, since 2×56666216² = 6422120071517312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56666216.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3541631 + ... + 3541646.

Almost surely, 2^56666216 is an apocalyptic number.

It is an amenable number.

56666216 is a deficient number, since it is larger than the sum of its proper divisors (49582954).

56666216 is a wasteful number, since it uses less digits than its factorization.

56666216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7083283 (or 7083279 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 56666216 is about 7527.6965932482. The cubic root of 56666216 is about 384.0974325969.

The spelling of 56666216 in words is "fifty-six million, six hundred sixty-six thousand, two hundred sixteen".