205138826454887 has 32 divisors (see below), whose sum is σ = 222906133142784. Its totient is φ = 187660327219200.

The previous prime is 205138826454869. The next prime is 205138826454941. The reversal of 205138826454887 is 788454628831502.

It is a cyclic number.

It is not a de Polignac number, because 205138826454887 - 2⁶ = 205138826454823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205138826454887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205138826654887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2935678193 + ... + 2935748069.

It is an arithmetic number, because the mean of its divisors is an integer number (6965816660712).

Almost surely, 2^{205138826454887} is an apocalyptic number.

205138826454887 is a deficient number, since it is larger than the sum of its proper divisors (17767306687897).

205138826454887 is a wasteful number, since it uses less digits than its factorization.

205138826454887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72779.

The product of its (nonzero) digits is 825753600, while the sum is 71.

The spelling of 205138826454887 in words is "two hundred five trillion, one hundred thirty-eight billion, eight hundred twenty-six million, four hundred fifty-four thousand, eight hundred eighty-seven".