66664488417 has 4 divisors (see below), whose sum is σ = 88885984560. Its totient is φ = 44442992276.

The previous prime is 66664488409. The next prime is 66664488421. The reversal of 66664488417 is 71488446666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66664488417 - 2³ = 66664488409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66664488467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11110748067 + ... + 11110748072.

It is an arithmetic number, because the mean of its divisors is an integer number (22221496140).

Almost surely, 2^66664488417 is an apocalyptic number.

It is an amenable number.

66664488417 is a deficient number, since it is larger than the sum of its proper divisors (22221496143).

66664488417 is a wasteful number, since it uses less digits than its factorization.

66664488417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22221496142.

The product of its digits is 37158912, while the sum is 60.

The spelling of 66664488417 in words is "sixty-six billion, six hundred sixty-four million, four hundred eighty-eight thousand, four hundred seventeen".