205411087730 has 16 divisors (see below), whose sum is σ = 378758006424. Its totient is φ = 80160424320.

The previous prime is 205411087727. The next prime is 205411087793. The reversal of 205411087730 is 37780114502.

205411087730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 453223²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 118949801881 + 86461285849 = 344891^2 + 294043^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 250500917 + ... + 250501736.

Almost surely, 2^205411087730 is an apocalyptic number.

205411087730 is a deficient number, since it is larger than the sum of its proper divisors (173346918694).

205411087730 is a wasteful number, since it uses less digits than its factorization.

205411087730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501002701.

The product of its (nonzero) digits is 47040, while the sum is 38.

The spelling of 205411087730 in words is "two hundred five billion, four hundred eleven million, eighty-seven thousand, seven hundred thirty".