205605736172472 has 16 divisors (see below), whose sum is σ = 514014340431240. Its totient is φ = 68535245390816.

The previous prime is 205605736172399. The next prime is 205605736172477. The reversal of 205605736172472 is 274271637506502.

It is a super-2 number, since 2×205605736172472² (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 (205605736172477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4283452836903 + ... + 4283452836950.

Almost surely, 2^{205605736172472} is an apocalyptic number.

It is an amenable number.

205605736172472 is an abundant number, since it is smaller than the sum of its proper divisors (308408604258768).

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

205605736172472 is a wasteful number, since it uses less digits than its factorization.

205605736172472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8566905673862 (or 8566905673858 counting only the distinct ones).

The product of its (nonzero) digits is 29635200, while the sum is 57.

The spelling of 205605736172472 in words is "two hundred five trillion, six hundred five billion, seven hundred thirty-six million, one hundred seventy-two thousand, four hundred seventy-two".