664961169398 has 8 divisors (see below), whose sum is σ = 997923849120. Its totient is φ = 332319886360.

The previous prime is 664961169371. The next prime is 664961169401. The reversal of 664961169398 is 893961169466.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 80343998 + ... + 80352273.

It is an arithmetic number, because the mean of its divisors is an integer number (124740481140).

Almost surely, 2^664961169398 is an apocalyptic number.

664961169398 is a deficient number, since it is larger than the sum of its proper divisors (332962679722).

664961169398 is a wasteful number, since it uses less digits than its factorization.

664961169398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160698342.

The product of its digits is 90699264, while the sum is 68.

Adding to 664961169398 its sum of digits (68), we get a palindrome (664961169466).

The spelling of 664961169398 in words is "six hundred sixty-four billion, nine hundred sixty-one million, one hundred sixty-nine thousand, three hundred ninety-eight".