11666504416720 has 80 divisors (see below), whose sum is σ = 27396284382720. Its totient is φ = 4619874752000.

The previous prime is 11666504416711. The next prime is 11666504416727. The reversal of 11666504416720 is 2761440566611.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×11666504416720² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666504416727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75640641 + ... + 75794719.

It is an arithmetic number, because the mean of its divisors is an integer number (342453554784).

Almost surely, 2^{11666504416720} is an apocalyptic number.

11666504416720 is a gapful number since it is divisible by the number (10) 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 11666504416720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13698142191360).

11666504416720 is an abundant number, since it is smaller than the sum of its proper divisors (15729779966000).

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

11666504416720 is a wasteful number, since it uses less digits than its factorization.

11666504416720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163564 (or 163558 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 11666504416720 in words is "eleven trillion, six hundred sixty-six billion, five hundred four million, four hundred sixteen thousand, seven hundred twenty".