205712415409 has 8 divisors (see below), whose sum is σ = 206997037920. Its totient is φ = 204429297600.

The previous prime is 205712415379. The next prime is 205712415487. The reversal of 205712415409 is 904514217502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205712415409 - 2²⁷ = 205578197681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205712415709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101272 + ... + 649369.

It is an arithmetic number, because the mean of its divisors is an integer number (25874629740).

Almost surely, 2^205712415409 is an apocalyptic number.

It is an amenable number.

205712415409 is a deficient number, since it is larger than the sum of its proper divisors (1284622511).

205712415409 is a wasteful number, since it uses less digits than its factorization.

205712415409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752351.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 205712415409 in words is "two hundred five billion, seven hundred twelve million, four hundred fifteen thousand, four hundred nine".