66510812843 has 16 divisors (see below), whose sum is σ = 70226781600. Its totient is φ = 62816705280.

The previous prime is 66510812803. The next prime is 66510812887. The reversal of 66510812843 is 34821801566.

It is a cyclic number.

It is not a de Polignac number, because 66510812843 - 2⁶ = 66510812779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66510812794 and 66510812803.

It is not an unprimeable number, because it can be changed into a prime (66510812803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8792783 + ... + 8800343.

It is an arithmetic number, because the mean of its divisors is an integer number (4389173850).

Almost surely, 2^66510812843 is an apocalyptic number.

66510812843 is a deficient number, since it is larger than the sum of its proper divisors (3715968757).

66510812843 is a wasteful number, since it uses less digits than its factorization.

66510812843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8942.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 66510812843 in words is "sixty-six billion, five hundred ten million, eight hundred twelve thousand, eight hundred forty-three".