66511510161 has 8 divisors (see below), whose sum is σ = 88690319040. Its totient is φ = 44336854032.

The previous prime is 66511510133. The next prime is 66511510183. The reversal of 66511510161 is 16101511566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66511510161 - 2¹⁰ = 66511509137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66511510661) by changing a digit.

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, 1000621 + ... + 1065018.

It is an arithmetic number, because the mean of its divisors is an integer number (11086289880).

Almost surely, 2^66511510161 is an apocalyptic number.

It is an amenable number.

66511510161 is a deficient number, since it is larger than the sum of its proper divisors (22178808879).

66511510161 is a wasteful number, since it uses less digits than its factorization.

66511510161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076375.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 66511510161 in words is "sixty-six billion, five hundred eleven million, five hundred ten thousand, one hundred sixty-one".