206420171745023 has 4 divisors (see below), whose sum is σ = 206420467091208. Its totient is φ = 206419876398840.

The previous prime is 206420171744989. The next prime is 206420171745037. The reversal of 206420171745023 is 320547171024602.

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

It is a cyclic number.

It is not a de Polignac number, because 206420171745023 - 2¹⁰ = 206420171743999 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 (206420171745043) 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, 146622236 + ... + 148023377.

It is an arithmetic number, because the mean of its divisors is an integer number (51605116772802).

Almost surely, 2^{206420171745023} is an apocalyptic number.

206420171745023 is a deficient number, since it is larger than the sum of its proper divisors (295346185).

206420171745023 is an equidigital number, since it uses as much as digits as its factorization.

206420171745023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295346184.

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 206420171745023 in words is "two hundred six trillion, four hundred twenty billion, one hundred seventy-one million, seven hundred forty-five thousand, twenty-three".