1666229731584 has 288 divisors, whose sum is σ = 4905340984320. Its totient is φ = 497912832000.

The previous prime is 1666229731583. The next prime is 1666229731633. The reversal of 1666229731584 is 4851379226661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1666229731583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177310374 + ... + 177319770.

Almost surely, 2^{1666229731584} 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 1666229731584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2452670492160).

1666229731584 is an abundant number, since it is smaller than the sum of its proper divisors (3239111252736).

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

1666229731584 is a wasteful number, since it uses less digits than its factorization.

1666229731584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9717 (or 9703 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 60.

The spelling of 1666229731584 in words is "one trillion, six hundred sixty-six billion, two hundred twenty-nine million, seven hundred thirty-one thousand, five hundred eighty-four".