2173556743680 has 640 divisors, whose sum is σ = 8446224264192. Its totient is φ = 465484382208.

The previous prime is 2173556743639. The next prime is 2173556743723. The reversal of 2173556743680 is 863476553712.

It is a tau number, because it is divible by the number of its divisors (640).

It is a self number, because there is not a number n which added to its sum of digits gives 2173556743680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 207454602 + ... + 207465078.

Almost surely, 2^{2173556743680} is an apocalyptic number.

2173556743680 is a gapful number since it is divisible by the number (20) 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 2173556743680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4223112132096).

2173556743680 is an abundant number, since it is smaller than the sum of its proper divisors (6272667520512).

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

2173556743680 is a wasteful number, since it uses less digits than its factorization.

2173556743680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10754 (or 10738 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 57.

The spelling of 2173556743680 in words is "two trillion, one hundred seventy-three billion, five hundred fifty-six million, seven hundred forty-three thousand, six hundred eighty".