2166257706 has 8 divisors (see below), whose sum is σ = 4332515424. Its totient is φ = 722085900.

The previous prime is 2166257651. The next prime is 2166257707. The reversal of 2166257706 is 6077526612.

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

2166257706 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (2166257707) 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, 180521470 + ... + 180521481.

It is an arithmetic number, because the mean of its divisors is an integer number (541564428).

Almost surely, 2^2166257706 is an apocalyptic number.

2166257706 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2166257706 is a wasteful number, since it uses less digits than its factorization.

2166257706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361042956.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 2166257706 is about 46543.0736630060. The cubic root of 2166257706 is about 1293.9079270257.

The spelling of 2166257706 in words is "two billion, one hundred sixty-six million, two hundred fifty-seven thousand, seven hundred six".