65666064 has 40 divisors (see below), whose sum is σ = 171794560. Its totient is φ = 21610368.

The previous prime is 65666057. The next prime is 65666089. The reversal of 65666064 is 46066656.

It is a super-2 number, since 2×65666064² = 8624063922504192, which contains 22 as substring.

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, 4867 + ... + 12450.

It is an arithmetic number, because the mean of its divisors is an integer number (4294864).

Almost surely, 2^65666064 is an apocalyptic number.

It is an amenable number.

65666064 is an abundant number, since it is smaller than the sum of its proper divisors (106128496).

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

65666064 is a wasteful number, since it uses less digits than its factorization.

65666064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17407 (or 17401 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 65666064 is about 8103.4600017523. The cubic root of 65666064 is about 403.4412758167.

The spelling of 65666064 in words is "sixty-five million, six hundred sixty-six thousand, sixty-four".