201720196801 has 4 divisors (see below), whose sum is σ = 201721496004. Its totient is φ = 201718897600.

The previous prime is 201720196787. The next prime is 201720196823. The reversal of 201720196801 is 108691027102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 177055808400 + 24664388401 = 420780^2 + 157049^2 .

It is a cyclic number.

It is not a de Polignac number, because 201720196801 - 2²⁵ = 201686642369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201720196891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379180 + ... + 739741.

It is an arithmetic number, because the mean of its divisors is an integer number (50430374001).

Almost surely, 2^201720196801 is an apocalyptic number.

It is an amenable number.

201720196801 is a deficient number, since it is larger than the sum of its proper divisors (1299203).

201720196801 is a wasteful number, since it uses less digits than its factorization.

201720196801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299202.

The product of its (nonzero) digits is 12096, while the sum is 37.

The spelling of 201720196801 in words is "two hundred one billion, seven hundred twenty million, one hundred ninety-six thousand, eight hundred one".