205756561923 has 16 divisors (see below), whose sum is σ = 300186463872. Its totient is φ = 124324200000.

The previous prime is 205756561921. The next prime is 205756561949. The reversal of 205756561923 is 329165657502.

It is not a de Polignac number, because 205756561923 - 2¹ = 205756561921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205756561921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9407578 + ... + 9429423.

It is an arithmetic number, because the mean of its divisors is an integer number (18761653992).

Almost surely, 2^205756561923 is an apocalyptic number.

205756561923 is a deficient number, since it is larger than the sum of its proper divisors (94429901949).

205756561923 is a wasteful number, since it uses less digits than its factorization.

205756561923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18837346.

The product of its (nonzero) digits is 3402000, while the sum is 51.

The spelling of 205756561923 in words is "two hundred five billion, seven hundred fifty-six million, five hundred sixty-one thousand, nine hundred twenty-three".