205128511250844 has 12 divisors (see below), whose sum is σ = 478633192918664. Its totient is φ = 68376170416944.

The previous prime is 205128511250843. The next prime is 205128511250933. The reversal of 205128511250844 is 448052115821502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×205128511250844² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205128511250793 and 205128511250802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205128511250843) 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, 8547021302107 + ... + 8547021302130.

Almost surely, 2^{205128511250844} is an apocalyptic number.

It is an amenable number.

205128511250844 is an abundant number, since it is smaller than the sum of its proper divisors (273504681667820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205128511250844 is a wasteful number, since it uses less digits than its factorization.

205128511250844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17094042604244 (or 17094042604242 counting only the distinct ones).

The product of its (nonzero) digits is 1024000, while the sum is 48.

The spelling of 205128511250844 in words is "two hundred five trillion, one hundred twenty-eight billion, five hundred eleven million, two hundred fifty thousand, eight hundred forty-four".