65666166 has 16 divisors (see below), whose sum is σ = 138244800. Its totient is φ = 20736648.

The previous prime is 65666149. The next prime is 65666171. The reversal of 65666166 is 66166656.

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, 287896 + ... + 288123.

It is an arithmetic number, because the mean of its divisors is an integer number (8640300).

Almost surely, 2^65666166 is an apocalyptic number.

65666166 is an abundant number, since it is smaller than the sum of its proper divisors (72578634).

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

65666166 is a wasteful number, since it uses less digits than its factorization.

65666166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576043.

The product of its digits is 233280, while the sum is 42.

The square root of 65666166 is about 8103.4662953578. The cubic root of 65666166 is about 403.4414847069.

The spelling of 65666166 in words is "sixty-five million, six hundred sixty-six thousand, one hundred sixty-six".