205717158031 has 32 divisors (see below), whose sum is σ = 260413387776. Its totient is φ = 157845408000.

The previous prime is 205717157963. The next prime is 205717158079. The reversal of 205717158031 is 130851717502.

It is not a de Polignac number, because 205717158031 - 2¹¹ = 205717155983 is a prime.

It is a super-2 number, since 2×205717158031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205717158331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4465491 + ... + 4511323.

It is an arithmetic number, because the mean of its divisors is an integer number (8137918368).

Almost surely, 2^205717158031 is an apocalyptic number.

205717158031 is a deficient number, since it is larger than the sum of its proper divisors (54696229745).

205717158031 is a wasteful number, since it uses less digits than its factorization.

205717158031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46743.

The product of its (nonzero) digits is 58800, while the sum is 40.

The spelling of 205717158031 in words is "two hundred five billion, seven hundred seventeen million, one hundred fifty-eight thousand, thirty-one".