1666630287360 has 800 divisors, whose sum is σ = 6138844588800. Its totient is φ = 432374022144.

The previous prime is 1666630287337. The next prime is 1666630287373. The reversal of 1666630287360 is 637820366661.

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

It is a junction number, because it is equal to n+sod(n) for n = 1666630287297 and 1666630287306.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9979821997 + ... + 9979822163.

It is an arithmetic number, because the mean of its divisors is an integer number (7673555736).

Almost surely, 2^{1666630287360} is an apocalyptic number.

1666630287360 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 1666630287360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3069422294400).

1666630287360 is an abundant number, since it is smaller than the sum of its proper divisors (4472214301440).

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

1666630287360 is an frugal number, since it uses more digits than its factorization.

1666630287360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 1666630287360 in words is "one trillion, six hundred sixty-six billion, six hundred thirty million, two hundred eighty-seven thousand, three hundred sixty".