66510511171051 has 4 divisors (see below), whose sum is σ = 70011064390600. Its totient is φ = 63009957951504.

The previous prime is 66510511170923. The next prime is 66510511171151. The reversal of 66510511171051 is 15017111501566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66510511171051 - 2⁷ = 66510511170923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66510511170995 and 66510511171013.

It is not an unprimeable number, because it can be changed into a prime (66510511171151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750276609746 + ... + 1750276609783.

It is an arithmetic number, because the mean of its divisors is an integer number (17502766097650).

Almost surely, 2^{66510511171051} is an apocalyptic number.

66510511171051 is a deficient number, since it is larger than the sum of its proper divisors (3500553219549).

66510511171051 is a wasteful number, since it uses less digits than its factorization.

66510511171051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500553219548.

The product of its (nonzero) digits is 31500, while the sum is 40.

The spelling of 66510511171051 in words is "sixty-six trillion, five hundred ten billion, five hundred eleven million, one hundred seventy-one thousand, fifty-one".