664891299122 has 6 divisors (see below), whose sum is σ = 997338678429. Its totient is φ = 332445072980.

The previous prime is 664891299097. The next prime is 664891299139. The reversal of 664891299122 is 221992198466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 631006220881 + 33885078241 = 794359^2 + 184079^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=576581.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 864872 + ... + 1441452.

Almost surely, 2^664891299122 is an apocalyptic number.

664891299122 is a deficient number, since it is larger than the sum of its proper divisors (332447379307).

664891299122 is an frugal number, since it uses more digits than its factorization.

664891299122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153164 (or 576583 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 59.

The spelling of 664891299122 in words is "six hundred sixty-four billion, eight hundred ninety-one million, two hundred ninety-nine thousand, one hundred twenty-two".