65565660 has 48 divisors (see below), whose sum is σ = 186181632. Its totient is φ = 17236800.

The previous prime is 65565653. The next prime is 65565671. The reversal of 65565660 is 6656556.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3436 + ... + 11955.

It is an arithmetic number, because the mean of its divisors is an integer number (3878784).

Almost surely, 2^65565660 is an apocalyptic number.

65565660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65565660 is an abundant number, since it is smaller than the sum of its proper divisors (120615972).

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

65565660 is a wasteful number, since it uses less digits than its factorization.

65565660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15474 (or 15472 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 65565660 is about 8097.2625003763. The cubic root of 65565660 is about 403.2355491537.

The spelling of 65565660 in words is "sixty-five million, five hundred sixty-five thousand, six hundred sixty".