66817898479 has 8 divisors (see below), whose sum is σ = 66946124960. Its totient is φ = 66689796096.

The previous prime is 66817898467. The next prime is 66817898507. The reversal of 66817898479 is 97489871866.

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

It is a cyclic number.

It is not a de Polignac number, because 66817898479 - 2⁹ = 66817897967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66817898579) 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 7 ways as a sum of consecutive naturals, for example, 1084987 + ... + 1144915.

It is an arithmetic number, because the mean of its divisors is an integer number (8368265620).

Almost surely, 2^66817898479 is an apocalyptic number.

66817898479 is a deficient number, since it is larger than the sum of its proper divisors (128226481).

66817898479 is a wasteful number, since it uses less digits than its factorization.

66817898479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62049.

The product of its digits is 292626432, while the sum is 73.

The spelling of 66817898479 in words is "sixty-six billion, eight hundred seventeen million, eight hundred ninety-eight thousand, four hundred seventy-nine".