2166505672 has 8 divisors (see below), whose sum is σ = 4062198150. Its totient is φ = 1083252832.

The previous prime is 2166505669. The next prime is 2166505681. The reversal of 2166505672 is 2765056612.

It can be written as a sum of positive squares in only one way, i.e., 2161692036 + 4813636 = 46494^2 + 2194^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135406597 + ... + 135406612.

Almost surely, 2^2166505672 is an apocalyptic number.

It is an amenable number.

2166505672 is a deficient number, since it is larger than the sum of its proper divisors (1895692478).

2166505672 is a wasteful number, since it uses less digits than its factorization.

2166505672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270813215 (or 270813211 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 2166505672 is about 46545.7374203052. The cubic root of 2166505672 is about 1293.9572952565.

The spelling of 2166505672 in words is "two billion, one hundred sixty-six million, five hundred five thousand, six hundred seventy-two".