206273967491 has 4 divisors (see below), whose sum is σ = 206360968584. Its totient is φ = 206186966400.

The previous prime is 206273967479. The next prime is 206273967521. The reversal of 206273967491 is 194769372602.

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 206273967491 - 2³⁴ = 189094098307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206273967091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43496990 + ... + 43501731.

It is an arithmetic number, because the mean of its divisors is an integer number (51590242146).

Almost surely, 2^206273967491 is an apocalyptic number.

206273967491 is a deficient number, since it is larger than the sum of its proper divisors (87001093).

206273967491 is an equidigital number, since it uses as much as digits as its factorization.

206273967491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87001092.

The product of its (nonzero) digits is 6858432, while the sum is 56.

The spelling of 206273967491 in words is "two hundred six billion, two hundred seventy-three million, nine hundred sixty-seven thousand, four hundred ninety-one".