656661065616 has 120 divisors (see below), whose sum is σ = 1957311987904. Its totient is φ = 212971109760.

The previous prime is 656661065569. The next prime is 656661065681. The reversal of 656661065616 is 616560166656.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2138500 + ... + 2426211.

Almost surely, 2^656661065616 is an apocalyptic number.

It is an amenable number.

656661065616 is an abundant number, since it is smaller than the sum of its proper divisors (1300650922288).

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

656661065616 is a wasteful number, since it uses less digits than its factorization.

656661065616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564771 (or 4564753 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 656661065616 in words is "six hundred fifty-six billion, six hundred sixty-one million, sixty-five thousand, six hundred sixteen".