1666155205340 has 12 divisors (see below), whose sum is σ = 3498925931256. Its totient is φ = 666462082128.

The previous prime is 1666155205331. The next prime is 1666155205343. The reversal of 1666155205340 is 435025516661.

It is a junction number, because it is equal to n+sod(n) for n = 1666155205291 and 1666155205300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666155205343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41653880114 + ... + 41653880153.

It is an arithmetic number, because the mean of its divisors is an integer number (291577160938).

Almost surely, 2^{1666155205340} is an apocalyptic number.

1666155205340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666155205340 is an abundant number, since it is smaller than the sum of its proper divisors (1832770725916).

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

1666155205340 is a wasteful number, since it uses less digits than its factorization.

1666155205340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83307760276 (or 83307760274 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 1666155205340 in words is "one trillion, six hundred sixty-six billion, one hundred fifty-five million, two hundred five thousand, three hundred forty".