205128511250845 has 128 divisors (see below), whose sum is σ = 322983843840000. Its totient is φ = 121432776791040.

The previous prime is 205128511250843. The next prime is 205128511250933. The reversal of 205128511250845 is 548052115821502.

It is not a de Polignac number, because 205128511250845 - 2¹ = 205128511250843 is a prime.

It is a super-2 number, since 2×205128511250845² (a number of 29 digits) contains 22 as substring.

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 127 ways as a sum of consecutive naturals, for example, 6897147675 + ... + 6897177415.

It is an arithmetic number, because the mean of its divisors is an integer number (2523311280000).

Almost surely, 2^{205128511250845} is an apocalyptic number.

It is an amenable number.

205128511250845 is a deficient number, since it is larger than the sum of its proper divisors (117855332589155).

205128511250845 is a wasteful number, since it uses less digits than its factorization.

205128511250845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39963.

The product of its (nonzero) digits is 1280000, while the sum is 49.

The spelling of 205128511250845 in words is "two hundred five trillion, one hundred twenty-eight billion, five hundred eleven million, two hundred fifty thousand, eight hundred forty-five".