206505515158 has 4 divisors (see below), whose sum is σ = 309758272740. Its totient is φ = 103252757578.

The previous prime is 206505515113. The next prime is 206505515159. The reversal of 206505515158 is 851515505602.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206505515159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51626378788 + ... + 51626378791.

It is an arithmetic number, because the mean of its divisors is an integer number (77439568185).

Almost surely, 2^206505515158 is an apocalyptic number.

206505515158 is a deficient number, since it is larger than the sum of its proper divisors (103252757582).

206505515158 is a wasteful number, since it uses less digits than its factorization.

206505515158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103252757581.

The product of its (nonzero) digits is 300000, while the sum is 43.

The spelling of 206505515158 in words is "two hundred six billion, five hundred five million, five hundred fifteen thousand, one hundred fifty-eight".