205440162122655 has 24 divisors (see below), whose sum is σ = 359424283647312. Its totient is φ = 108544085654784.

The previous prime is 205440162122639. The next prime is 205440162122669. The reversal of 205440162122655 is 556221261044502.

205440162122655 is a `hidden beast` number, since 2 + 0 + 5 + 4 + 401 + 6 + 212 + 26 + 5 + 5 = 666.

It is not a de Polignac number, because 205440162122655 - 2⁴ = 205440162122639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 205440162122655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21333345354 + ... + 21333354983.

It is an arithmetic number, because the mean of its divisors is an integer number (14976011818638).

Almost surely, 2^{205440162122655} is an apocalyptic number.

205440162122655 is a deficient number, since it is larger than the sum of its proper divisors (153984121524657).

205440162122655 is a wasteful number, since it uses less digits than its factorization.

205440162122655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42666700455 (or 42666700452 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 205440162122655 in words is "two hundred five trillion, four hundred forty billion, one hundred sixty-two million, one hundred twenty-two thousand, six hundred fifty-five".