201720196823 has 2 divisors, whose sum is σ = 201720196824. Its totient is φ = 201720196822.

The previous prime is 201720196787. The next prime is 201720196883. The reversal of 201720196823 is 328691027102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201720196823 - 2¹⁶ = 201720131287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201720196883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100860098411 + 100860098412.

It is an arithmetic number, because the mean of its divisors is an integer number (100860098412).

Almost surely, 2^201720196823 is an apocalyptic number.

201720196823 is a deficient number, since it is larger than the sum of its proper divisors (1).

201720196823 is an equidigital number, since it uses as much as digits as its factorization.

201720196823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 201720196823 in words is "two hundred one billion, seven hundred twenty million, one hundred ninety-six thousand, eight hundred twenty-three".