2173258561000 has 64 divisors (see below), whose sum is σ = 5088290996880. Its totient is φ = 868813516800.

The previous prime is 2173258560989. The next prime is 2173258561031. The reversal of 2173258561000 is 1658523712.

It can be written as a sum of positive squares in 8 ways, for example, as 206572068004 + 1966686492996 = 454502^2 + 1402386^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1165504 + ... + 2388496.

Almost surely, 2^{2173258561000} is an apocalyptic number.

2173258561000 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 2173258561000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2544145498440).

2173258561000 is an abundant number, since it is smaller than the sum of its proper divisors (2915032435880).

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

2173258561000 is a wasteful number, since it uses less digits than its factorization.

2173258561000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224791 (or 1224777 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 2173258561000 in words is "two trillion, one hundred seventy-three billion, two hundred fifty-eight million, five hundred sixty-one thousand".