2166545784 has 64 divisors (see below), whose sum is σ = 5928683040. Its totient is φ = 655695360.

The previous prime is 2166545783. The next prime is 2166545827. The reversal of 2166545784 is 4875456612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166545783) 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, 37887 + ... + 75950.

Almost surely, 2^2166545784 is an apocalyptic number.

2166545784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2166545784 is an abundant number, since it is smaller than the sum of its proper divisors (3762137256).

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

2166545784 is a wasteful number, since it uses less digits than its factorization.

2166545784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113920 (or 113916 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 48.

The square root of 2166545784 is about 46546.1683063171. The cubic root of 2166545784 is about 1293.9652809106.

The spelling of 2166545784 in words is "two billion, one hundred sixty-six million, five hundred forty-five thousand, seven hundred eighty-four".