66510566160 has 40 divisors (see below), whose sum is σ = 206182755840. Its totient is φ = 17736150912.

The previous prime is 66510566149. The next prime is 66510566191. The reversal of 66510566160 is 6166501566.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138563440 + ... + 138563919.

It is an arithmetic number, because the mean of its divisors is an integer number (5154568896).

Almost surely, 2^66510566160 is an apocalyptic number.

66510566160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66510566160 is an abundant number, since it is smaller than the sum of its proper divisors (139672189680).

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

66510566160 is a wasteful number, since it uses less digits than its factorization.

66510566160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277127375 (or 277127369 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 66510566160 in words is "sixty-six billion, five hundred ten million, five hundred sixty-six thousand, one hundred sixty".