66796800001 has 4 divisors (see below), whose sum is σ = 66797718100. Its totient is φ = 66795881904.

The previous prime is 66796799989. The next prime is 66796800019. The reversal of 66796800001 is 10000869766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10000869766 = 2 ⋅5000434883.

It can be written as a sum of positive squares in 2 ways, for example, as 28017738225 + 38779061776 = 167385^2 + 196924^2 .

It is a cyclic number.

It is not a de Polignac number, because 66796800001 - 2⁷ = 66796799873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66796800601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339546 + ... + 498883.

It is an arithmetic number, because the mean of its divisors is an integer number (16699429525).

Almost surely, 2^66796800001 is an apocalyptic number.

It is an amenable number.

66796800001 is a deficient number, since it is larger than the sum of its proper divisors (918099).

66796800001 is an equidigital number, since it uses as much as digits as its factorization.

66796800001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918098.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 66796800001 in words is "sixty-six billion, seven hundred ninety-six million, eight hundred thousand, one".