205812431506 has 60 divisors (see below), whose sum is σ = 360124259310. Its totient is φ = 87911165760.

The previous prime is 205812431497. The next prime is 205812431527. The reversal of 205812431506 is 605134218502.

It can be written as a sum of positive squares in only one way, i.e., 151332670225 + 54479761281 = 389015^2 + 233409^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 320081221 + ... + 320081863.

Almost surely, 2^205812431506 is an apocalyptic number.

205812431506 is a deficient number, since it is larger than the sum of its proper divisors (154311827804).

205812431506 is an frugal number, since it uses more digits than its factorization.

205812431506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 205812431506 in words is "two hundred five billion, eight hundred twelve million, four hundred thirty-one thousand, five hundred six".