205311470364491 has 8 divisors (see below), whose sum is σ = 216501204621120. Its totient is φ = 194160122847432.

The previous prime is 205311470364487. The next prime is 205311470364509. The reversal of 205311470364491 is 194463074113502.

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 205311470364491 - 2² = 205311470364487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205311470364461) 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, 9596673905 + ... + 9596695298.

It is an arithmetic number, because the mean of its divisors is an integer number (27062650577640).

Almost surely, 2^{205311470364491} is an apocalyptic number.

205311470364491 is a deficient number, since it is larger than the sum of its proper divisors (11189734256629).

205311470364491 is a wasteful number, since it uses less digits than its factorization.

205311470364491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19193369785.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 205311470364491 in words is "two hundred five trillion, three hundred eleven billion, four hundred seventy million, three hundred sixty-four thousand, four hundred ninety-one".