9664507818842 has 8 divisors (see below), whose sum is σ = 14498297918676. Its totient is φ = 4831741845952.

The previous prime is 9664507818817. The next prime is 9664507818899. The reversal of 9664507818842 is 2488187054669.

It can be written as a sum of positive squares in 2 ways, for example, as 9351186636841 + 313321182001 = 3057971^2 + 559751^2 .

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

It is a super-2 number, since 2×9664507818842² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256008143 + ... + 256045890.

Almost surely, 2^{9664507818842} is an apocalyptic number.

9664507818842 is a deficient number, since it is larger than the sum of its proper divisors (4833790099834).

9664507818842 is a wasteful number, since it uses less digits than its factorization.

9664507818842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512063472.

The product of its (nonzero) digits is 185794560, while the sum is 68.

The spelling of 9664507818842 in words is "nine trillion, six hundred sixty-four billion, five hundred seven million, eight hundred eighteen thousand, eight hundred forty-two".