65660560 has 40 divisors (see below), whose sum is σ = 174470976. Its totient is φ = 22512000.

The previous prime is 65660549. The next prime is 65660591. The reversal of 65660560 is 6506656.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×65660560² = 8622618279027200, which contains 22 as substring.

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, 58066 + ... + 59185.

Almost surely, 2^65660560 is an apocalyptic number.

It is an amenable number.

65660560 is an abundant number, since it is smaller than the sum of its proper divisors (108810416).

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

65660560 is a wasteful number, since it uses less digits than its factorization.

65660560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117271 (or 117265 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 65660560 is about 8103.1203866165. The cubic root of 65660560 is about 403.4300036177.

It can be divided in two parts, 65660 and 560, that multiplied together give a triangular number (36769600 = T₈₅₇₅).

The spelling of 65660560 in words is "sixty-five million, six hundred sixty thousand, five hundred sixty".