2175680644 has 6 divisors (see below), whose sum is σ = 3807441134. Its totient is φ = 1087840320.

The previous prime is 2175680599. The next prime is 2175680651. The reversal of 2175680644 is 4460865712.

It can be written as a sum of positive squares in only one way, i.e., 2175103044 + 577600 = 46638^2 + 760^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2175680644.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271960077 + ... + 271960084.

Almost surely, 2^2175680644 is an apocalyptic number.

It is an amenable number.

2175680644 is a deficient number, since it is larger than the sum of its proper divisors (1631760490).

2175680644 is a wasteful number, since it uses less digits than its factorization.

2175680644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543920165 (or 543920163 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The square root of 2175680644 is about 46644.1919642735. The cubic root of 2175680644 is about 1295.7813234470.

It can be divided in two parts, 21756 and 80644, that added together give a square (102400 = 320²).

The spelling of 2175680644 in words is "two billion, one hundred seventy-five million, six hundred eighty thousand, six hundred forty-four".