16661326313340 has 288 divisors, whose sum is σ = 53057144125440. Its totient is φ = 4226638579200.

The previous prime is 16661326313329. The next prime is 16661326313383. The reversal of 16661326313340 is 4331362316661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 594629851 + ... + 594657869.

It is an arithmetic number, because the mean of its divisors is an integer number (184226194880).

Almost surely, 2^{16661326313340} is an apocalyptic number.

16661326313340 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 16661326313340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26528572062720).

16661326313340 is an abundant number, since it is smaller than the sum of its proper divisors (36395817812100).

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

16661326313340 is a wasteful number, since it uses less digits than its factorization.

16661326313340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29873 (or 29868 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 45.

The spelling of 16661326313340 in words is "sixteen trillion, six hundred sixty-one billion, three hundred twenty-six million, three hundred thirteen thousand, three hundred forty".