65656660 has 12 divisors (see below), whose sum is σ = 137879028. Its totient is φ = 26262656.

The previous prime is 65656649. The next prime is 65656687. The reversal of 65656660 is 6665656.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33779344 + 31877316 = 5812^2 + 5646^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1641397 + ... + 1641436.

It is an arithmetic number, because the mean of its divisors is an integer number (11489919).

Almost surely, 2^65656660 is an apocalyptic number.

It is an amenable number.

65656660 is an abundant number, since it is smaller than the sum of its proper divisors (72222368).

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

65656660 is a wasteful number, since it uses less digits than its factorization.

65656660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282842 (or 3282840 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 65656660 is about 8102.8797350078. The cubic root of 65656660 is about 403.4220160314.

It can be divided in two parts, 6565 and 6660, that added together give a square (13225 = 115²).

The spelling of 65656660 in words is "sixty-five million, six hundred fifty-six thousand, six hundred sixty".