666532617754080 has 1536 divisors, whose sum is σ = 2783232282378240. Its totient is φ = 129888561070080.

The previous prime is 666532617754057. The next prime is 666532617754109. The reversal of 666532617754080 is 80457716235666.

It is a happy number.

It is a super-3 number, since 3×666532617754080³ (a number of 45 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 143742205522 + ... + 143742210158.

It is an arithmetic number, because the mean of its divisors is an integer number (1812000183840).

Almost surely, 2^{666532617754080} is an apocalyptic number.

666532617754080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666532617754080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1391616141189120).

666532617754080 is an abundant number, since it is smaller than the sum of its proper divisors (2116699664624160).

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

666532617754080 is a wasteful number, since it uses less digits than its factorization.

666532617754080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6712 (or 6704 counting only the distinct ones).

The product of its (nonzero) digits is 304819200, while the sum is 66.

The spelling of 666532617754080 in words is "six hundred sixty-six trillion, five hundred thirty-two billion, six hundred seventeen million, seven hundred fifty-four thousand, eighty".