664883367667 has 4 divisors (see below), whose sum is σ = 664891246440. Its totient is φ = 664875488896.

The previous prime is 664883367611. The next prime is 664883367671. The reversal of 664883367667 is 766763388466.

It is a happy number.

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 664883367667 - 2¹⁹ = 664882843379 is a prime.

It is a super-2 number, since 2×664883367667² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664883367596 and 664883367605.

It is not an unprimeable number, because it can be changed into a prime (664883367067) 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, 3811417 + ... + 3982042.

It is an arithmetic number, because the mean of its divisors is an integer number (166222811610).

Almost surely, 2^664883367667 is an apocalyptic number.

664883367667 is a deficient number, since it is larger than the sum of its proper divisors (7878773).

664883367667 is an equidigital number, since it uses as much as digits as its factorization.

664883367667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7878772.

The product of its digits is 877879296, while the sum is 70.

The spelling of 664883367667 in words is "six hundred sixty-four billion, eight hundred eighty-three million, three hundred sixty-seven thousand, six hundred sixty-seven".