2166454090 has 8 divisors (see below), whose sum is σ = 3899617380. Its totient is φ = 866581632.

The previous prime is 2166454061. The next prime is 2166454091. The reversal of 2166454090 is 904546612.

It can be written as a sum of positive squares in 2 ways, for example, as 1927473409 + 238980681 = 43903^2 + 15459^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2166454091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108322695 + ... + 108322714.

Almost surely, 2^2166454090 is an apocalyptic number.

2166454090 is a deficient number, since it is larger than the sum of its proper divisors (1733163290).

2166454090 is a wasteful number, since it uses less digits than its factorization.

2166454090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216645416.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 2166454090 is about 46545.1833168589. The cubic root of 2166454090 is about 1293.9470259650.

The spelling of 2166454090 in words is "two billion, one hundred sixty-six million, four hundred fifty-four thousand, ninety".