2166543372 has 48 divisors (see below), whose sum is σ = 5779952640. Its totient is φ = 618744192.

The previous prime is 2166543371. The next prime is 2166543373. The reversal of 2166543372 is 2733456612.

It is an interprime number because it is at equal distance from previous prime (2166543371) and next prime (2166543373).

It is a self number, because there is not a number n which added to its sum of digits gives 2166543372.

It is not an unprimeable number, because it can be changed into a prime (2166543371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269629 + ... + 277547.

It is an arithmetic number, because the mean of its divisors is an integer number (120415680).

Almost surely, 2^2166543372 is an apocalyptic number.

It is an amenable number.

2166543372 is an abundant number, since it is smaller than the sum of its proper divisors (3613409268).

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

2166543372 is a wasteful number, since it uses less digits than its factorization.

2166543372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11190 (or 11188 counting only the distinct ones).

The product of its digits is 181440, while the sum is 39.

The square root of 2166543372 is about 46546.1423965510. The cubic root of 2166543372 is about 1293.9648007230.

Adding to 2166543372 its reverse (2733456612), we get a palindrome (4899999984).

The spelling of 2166543372 in words is "two billion, one hundred sixty-six million, five hundred forty-three thousand, three hundred seventy-two".