2173452666 has 128 divisors (see below), whose sum is σ = 5700243456. Its totient is φ = 535687680.

The previous prime is 2173452653. The next prime is 2173452683. The reversal of 2173452666 is 6662543712.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon 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, 1455016 + ... + 1456508.

It is an arithmetic number, because the mean of its divisors is an integer number (44533152).

Almost surely, 2^2173452666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2173452666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2850121728).

2173452666 is an abundant number, since it is smaller than the sum of its proper divisors (3526790790).

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

2173452666 is a wasteful number, since it uses less digits than its factorization.

2173452666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676.

The product of its digits is 362880, while the sum is 42.

The square root of 2173452666 is about 46620.3031521675. The cubic root of 2173452666 is about 1295.3388629376.

The spelling of 2173452666 in words is "two billion, one hundred seventy-three million, four hundred fifty-two thousand, six hundred sixty-six".