205440555187 has 8 divisors (see below), whose sum is σ = 235238137856. Its totient is φ = 175755205512.

The previous prime is 205440555167. The next prime is 205440555211. The reversal of 205440555187 is 781555044502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205440555187 - 2¹¹ = 205440553139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205440555167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28054323 + ... + 28061644.

It is an arithmetic number, because the mean of its divisors is an integer number (29404767232).

Almost surely, 2^205440555187 is an apocalyptic number.

205440555187 is a deficient number, since it is larger than the sum of its proper divisors (29797582669).

205440555187 is an equidigital number, since it uses as much as digits as its factorization.

205440555187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56116497.

The product of its (nonzero) digits is 1120000, while the sum is 46.

Adding to 205440555187 its reverse (781555044502), we get a palindrome (986995599689).

The spelling of 205440555187 in words is "two hundred five billion, four hundred forty million, five hundred fifty-five thousand, one hundred eighty-seven".