205403231051 has 16 divisors (see below), whose sum is σ = 220229190720. Its totient is φ = 190891192320.

The previous prime is 205403231041. The next prime is 205403231069. The reversal of 205403231051 is 150132304502.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205403231051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205403231051.

It is not an unprimeable number, because it can be changed into a prime (205403231041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 582041 + ... + 865781.

It is an arithmetic number, because the mean of its divisors is an integer number (13764324420).

Almost surely, 2^205403231051 is an apocalyptic number.

205403231051 is a deficient number, since it is larger than the sum of its proper divisors (14825959669).

205403231051 is a wasteful number, since it uses less digits than its factorization.

205403231051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284294.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 205403231051 its reverse (150132304502), we get a palindrome (355535535553).

The spelling of 205403231051 in words is "two hundred five billion, four hundred three million, two hundred thirty-one thousand, fifty-one".