1720251664172 has 12 divisors (see below), whose sum is σ = 3010474946136. Its totient is φ = 860115965280.

The previous prime is 1720251664169. The next prime is 1720251664207. The reversal of 1720251664172 is 2714661520271.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2067233 + ... + 2777400.

It is an arithmetic number, because the mean of its divisors is an integer number (250872912178).

Almost surely, 2^{1720251664172} is an apocalyptic number.

It is an amenable number.

1720251664172 is a deficient number, since it is larger than the sum of its proper divisors (1290223281964).

1720251664172 is a wasteful number, since it uses less digits than its factorization.

1720251664172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933408 (or 4933406 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 1720251664172 in words is "one trillion, seven hundred twenty billion, two hundred fifty-one million, six hundred sixty-four thousand, one hundred seventy-two".