66561505160 has 32 divisors (see below), whose sum is σ = 149774883840. Its totient is φ = 26622558144.

The previous prime is 66561505159. The next prime is 66561505181. The reversal of 66561505160 is 6150516566.

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, 532409 + ... + 645431.

It is an arithmetic number, because the mean of its divisors is an integer number (4680465120).

Almost surely, 2^66561505160 is an apocalyptic number.

It is an amenable number.

66561505160 is an abundant number, since it is smaller than the sum of its proper divisors (83213378680).

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

66561505160 is a wasteful number, since it uses less digits than its factorization.

66561505160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127757 (or 127753 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 66561505160 in words is "sixty-six billion, five hundred sixty-one million, five hundred five thousand, one hundred sixty".