664631350332 has 12 divisors (see below), whose sum is σ = 1550806484136. Its totient is φ = 221543783440.

The previous prime is 664631350301. The next prime is 664631350351. The reversal of 664631350332 is 233053136466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×664631350332³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

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, 27692972919 + ... + 27692972942.

It is an arithmetic number, because the mean of its divisors is an integer number (129233873678).

Almost surely, 2^664631350332 is an apocalyptic number.

It is an amenable number.

664631350332 is an abundant number, since it is smaller than the sum of its proper divisors (886175133804).

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

664631350332 is a wasteful number, since it uses less digits than its factorization.

664631350332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55385945868 (or 55385945866 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 42.

Adding to 664631350332 its reverse (233053136466), we get a palindrome (897684486798).

The spelling of 664631350332 in words is "six hundred sixty-four billion, six hundred thirty-one million, three hundred fifty thousand, three hundred thirty-two".