205054315451 has 4 divisors (see below), whose sum is σ = 205104345000. Its totient is φ = 205004285904.

The previous prime is 205054315421. The next prime is 205054315481. The reversal of 205054315451 is 154513450502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154513450502 = 2 ⋅77256725251.

It is an interprime number because it is at equal distance from previous prime (205054315421) and next prime (205054315481).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205054315451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205054315421) 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 3 ways as a sum of consecutive naturals, for example, 25008626 + ... + 25016823.

It is an arithmetic number, because the mean of its divisors is an integer number (51276086250).

Almost surely, 2^205054315451 is an apocalyptic number.

205054315451 is a deficient number, since it is larger than the sum of its proper divisors (50029549).

205054315451 is an equidigital number, since it uses as much as digits as its factorization.

205054315451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50029548.

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 205054315451 its reverse (154513450502), we get a palindrome (359567765953).

The spelling of 205054315451 in words is "two hundred five billion, fifty-four million, three hundred fifteen thousand, four hundred fifty-one".