205071738911 has 4 divisors (see below), whose sum is σ = 220846488072. Its totient is φ = 189296989752.

The previous prime is 205071738899. The next prime is 205071738931. The reversal of 205071738911 is 119837170502.

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

It is not a de Polignac number, because 205071738911 - 2¹⁸ = 205071476767 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 (205071738931) 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, 7887374561 + ... + 7887374586.

It is an arithmetic number, because the mean of its divisors is an integer number (55211622018).

Almost surely, 2^205071738911 is an apocalyptic number.

205071738911 is a deficient number, since it is larger than the sum of its proper divisors (15774749161).

205071738911 is a wasteful number, since it uses less digits than its factorization.

205071738911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15774749160.

The product of its (nonzero) digits is 105840, while the sum is 44.

The spelling of 205071738911 in words is "two hundred five billion, seventy-one million, seven hundred thirty-eight thousand, nine hundred eleven".