2172519668 has 36 divisors (see below), whose sum is σ = 4187187396. Its totient is φ = 985564800.

The previous prime is 2172519647. The next prime is 2172519677. The reversal of 2172519668 is 8669152712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1694310244 + 478209424 = 41162^2 + 21868^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257696 + ... + 265992.

It is an arithmetic number, because the mean of its divisors is an integer number (116310761).

Almost surely, 2^2172519668 is an apocalyptic number.

It is an amenable number.

2172519668 is a deficient number, since it is larger than the sum of its proper divisors (2014667728).

2172519668 is a wasteful number, since it uses less digits than its factorization.

2172519668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8864 (or 8851 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 2172519668 is about 46610.2957295918. The cubic root of 2172519668 is about 1295.1534863768.

The spelling of 2172519668 in words is "two billion, one hundred seventy-two million, five hundred nineteen thousand, six hundred sixty-eight".