664986689466 has 16 divisors (see below), whose sum is σ = 1450880049888. Its totient is φ = 201511118000.

The previous prime is 664986689447. The next prime is 664986689467.

664986689466 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 664986689391 and 664986689400.

It is not an unprimeable number, because it can be changed into a prime (664986689467) 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, 5037777885 + ... + 5037778016.

It is an arithmetic number, because the mean of its divisors is an integer number (90680003118).

Almost surely, 2^664986689466 is an apocalyptic number.

664986689466 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

664986689466 is an abundant number, since it is smaller than the sum of its proper divisors (785893360422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664986689466 is a wasteful number, since it uses less digits than its factorization.

664986689466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10075555917.

The product of its digits is 3869835264, while the sum is 78.

The spelling of 664986689466 in words is "six hundred sixty-four billion, nine hundred eighty-six million, six hundred eighty-nine thousand, four hundred sixty-six".