664801611232 has 36 divisors (see below), whose sum is σ = 1438629321528. Its totient is φ = 302182548800.

The previous prime is 664801611203. The next prime is 664801611233. The reversal of 664801611232 is 232116108466.

It is a happy number.

It is a super-2 number, since 2×664801611232² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664801611233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85843444 + ... + 85851187.

It is an arithmetic number, because the mean of its divisors is an integer number (39961925598).

Almost surely, 2^664801611232 is an apocalyptic number.

It is an amenable number.

664801611232 is an abundant number, since it is smaller than the sum of its proper divisors (773827710296).

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

664801611232 is a wasteful number, since it uses less digits than its factorization.

664801611232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171694663 (or 171694644 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

Adding to 664801611232 its reverse (232116108466), we get a palindrome (896917719698).

The spelling of 664801611232 in words is "six hundred sixty-four billion, eight hundred one million, six hundred eleven thousand, two hundred thirty-two".