66510172516193 has 16 divisors (see below), whose sum is σ = 77783372895360. Its totient is φ = 55680046482816.

The previous prime is 66510172516171. The next prime is 66510172516199. The reversal of 66510172516193 is 39161527101566.

It is not a de Polignac number, because 66510172516193 - 2¹⁸ = 66510172254049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66510172516199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90221 + ... + 11533797.

It is an arithmetic number, because the mean of its divisors is an integer number (4861460805960).

Almost surely, 2^{66510172516193} is an apocalyptic number.

It is an amenable number.

66510172516193 is a deficient number, since it is larger than the sum of its proper divisors (11273200379167).

66510172516193 is a wasteful number, since it uses less digits than its factorization.

66510172516193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11462936.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The spelling of 66510172516193 in words is "sixty-six trillion, five hundred ten billion, one hundred seventy-two million, five hundred sixteen thousand, one hundred ninety-three".