205755825531 has 4 divisors (see below), whose sum is σ = 274341100712. Its totient is φ = 137170550352.

The previous prime is 205755825523. The next prime is 205755825571. The reversal of 205755825531 is 135528557502.

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

It is not a de Polignac number, because 205755825531 - 2³ = 205755825523 is a prime.

It is a super-2 number, since 2×205755825531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205755825571) 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, 34292637586 + ... + 34292637591.

It is an arithmetic number, because the mean of its divisors is an integer number (68585275178).

Almost surely, 2^205755825531 is an apocalyptic number.

205755825531 is a deficient number, since it is larger than the sum of its proper divisors (68585275181).

205755825531 is an equidigital number, since it uses as much as digits as its factorization.

205755825531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68585275180.

The product of its (nonzero) digits is 2100000, while the sum is 48.

The spelling of 205755825531 in words is "two hundred five billion, seven hundred fifty-five million, eight hundred twenty-five thousand, five hundred thirty-one".