205847979591701 has 4 divisors (see below), whose sum is σ = 209336928398400. Its totient is φ = 202359030785004.

The previous prime is 205847979591689. The next prime is 205847979591731. The reversal of 205847979591701 is 107195979748502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205847979591701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205847979591731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1744474403261 + ... + 1744474403378.

It is an arithmetic number, because the mean of its divisors is an integer number (52334232099600).

Almost surely, 2^{205847979591701} is an apocalyptic number.

It is an amenable number.

205847979591701 is a deficient number, since it is larger than the sum of its proper divisors (3488948806699).

205847979591701 is an equidigital number, since it uses as much as digits as its factorization.

205847979591701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488948806698.

The product of its (nonzero) digits is 400075200, while the sum is 74.

The spelling of 205847979591701 in words is "two hundred five trillion, eight hundred forty-seven billion, nine hundred seventy-nine million, five hundred ninety-one thousand, seven hundred one".