1721849344973 has 16 divisors (see below), whose sum is σ = 1746471948480. Its totient is φ = 1697323310976.

The previous prime is 1721849344961. The next prime is 1721849344981. The reversal of 1721849344973 is 3794439481271.

It is a cyclic number.

It is not a de Polignac number, because 1721849344973 - 2³⁰ = 1720775603149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721849344073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71645123 + ... + 71669151.

It is an arithmetic number, because the mean of its divisors is an integer number (109154496780).

Almost surely, 2^{1721849344973} is an apocalyptic number.

It is an amenable number.

1721849344973 is a deficient number, since it is larger than the sum of its proper divisors (24622603507).

1721849344973 is a wasteful number, since it uses less digits than its factorization.

1721849344973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25996.

The product of its digits is 36578304, while the sum is 62.

The spelling of 1721849344973 in words is "one trillion, seven hundred twenty-one billion, eight hundred forty-nine million, three hundred forty-four thousand, nine hundred seventy-three".