6661065560 has 16 divisors (see below), whose sum is σ = 14987397600. Its totient is φ = 2664426208.

The previous prime is 6661065557. The next prime is 6661065577. The reversal of 6661065560 is 655601666.

It is a super-2 number, since 2×6661065560² = 88739588789236227200, 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 3 ways as a sum of consecutive naturals, for example, 83263280 + ... + 83263359.

It is an arithmetic number, because the mean of its divisors is an integer number (936712350).

Almost surely, 2^6661065560 is an apocalyptic number.

It is an amenable number.

6661065560 is an abundant number, since it is smaller than the sum of its proper divisors (8326332040).

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

6661065560 is a wasteful number, since it uses less digits than its factorization.

6661065560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166526650 (or 166526646 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 6661065560 is about 81615.3512520776. The cubic root of 6661065560 is about 1881.5448257629.

The spelling of 6661065560 in words is "six billion, six hundred sixty-one million, sixty-five thousand, five hundred sixty".