664536711168 has 576 divisors, whose sum is σ = 2182442900040. Its totient is φ = 200658124800.

The previous prime is 664536711121. The next prime is 664536711169. The reversal of 664536711168 is 861117635466.

It is a happy number.

664536711168 is a `hidden beast` number, since 6 + 6 + 453 + 6 + 71 + 116 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664536711169) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2364899188 + ... + 2364899468.

Almost surely, 2^664536711168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664536711168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091221450020).

664536711168 is an abundant number, since it is smaller than the sum of its proper divisors (1517906188872).

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

664536711168 is an frugal number, since it uses more digits than its factorization.

664536711168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 297 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 664536711168 in words is "six hundred sixty-four billion, five hundred thirty-six million, seven hundred eleven thousand, one hundred sixty-eight".