2166045420 has 96 divisors (see below), whose sum is σ = 7561483776. Its totient is φ = 450086400.

The previous prime is 2166045403. The next prime is 2166045433. The reversal of 2166045420 is 245406612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 229801 + ... + 239040.

It is an arithmetic number, because the mean of its divisors is an integer number (78765456).

Almost surely, 2^2166045420 is an apocalyptic number.

2166045420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166045420 is an abundant number, since it is smaller than the sum of its proper divisors (5395438356).

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

2166045420 is a wasteful number, since it uses less digits than its factorization.

2166045420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468871 (or 468869 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2166045420 is about 46540.7930744632. The cubic root of 2166045420 is about 1293.8656594305.

The spelling of 2166045420 in words is "two billion, one hundred sixty-six million, forty-five thousand, four hundred twenty".