205870831973 has 4 divisors (see below), whose sum is σ = 206335552128. Its totient is φ = 205406111820.

The previous prime is 205870831939. The next prime is 205870831987. The reversal of 205870831973 is 379138078502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205870831973 - 2¹⁸ = 205870569829 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 (205870831913) 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, 232359413 + ... + 232360298.

It is an arithmetic number, because the mean of its divisors is an integer number (51583888032).

Almost surely, 2^205870831973 is an apocalyptic number.

It is an amenable number.

205870831973 is a deficient number, since it is larger than the sum of its proper divisors (464720155).

205870831973 is an equidigital number, since it uses as much as digits as its factorization.

205870831973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464720154.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 205870831973 in words is "two hundred five billion, eight hundred seventy million, eight hundred thirty-one thousand, nine hundred seventy-three".