1666469279232 has 160 divisors (see below), whose sum is σ = 5013733966560. Its totient is φ = 546383093760.

The previous prime is 1666469279191. The next prime is 1666469279269. The reversal of 1666469279232 is 2329729646661.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1666469279232.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144843 + ... + 1831370.

It is an arithmetic number, because the mean of its divisors is an integer number (31335837291).

Almost surely, 2^{1666469279232} is an apocalyptic number.

1666469279232 is a gapful number since it is divisible by the number (12) 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 1666469279232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2506866983280).

1666469279232 is an abundant number, since it is smaller than the sum of its proper divisors (3347264687328).

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

1666469279232 is an equidigital number, since it uses as much as digits as its factorization.

1666469279232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976301 (or 1976279 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 63.

The spelling of 1666469279232 in words is "one trillion, six hundred sixty-six billion, four hundred sixty-nine million, two hundred seventy-nine thousand, two hundred thirty-two".