205131530155142 has 4 divisors (see below), whose sum is σ = 307697295232716. Its totient is φ = 102565765077570.

The previous prime is 205131530155129. The next prime is 205131530155219. The reversal of 205131530155142 is 241551035131502.

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

It is a junction number, because it is equal to n+sod(n) for n = 205131530155096 and 205131530155105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51282882538784 + ... + 51282882538787.

It is an arithmetic number, because the mean of its divisors is an integer number (76924323808179).

Almost surely, 2^{205131530155142} is an apocalyptic number.

205131530155142 is a deficient number, since it is larger than the sum of its proper divisors (102565765077574).

205131530155142 is a wasteful number, since it uses less digits than its factorization.

205131530155142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102565765077573.

The product of its (nonzero) digits is 90000, while the sum is 38.

Adding to 205131530155142 its reverse (241551035131502), we get a palindrome (446682565286644).

The spelling of 205131530155142 in words is "two hundred five trillion, one hundred thirty-one billion, five hundred thirty million, one hundred fifty-five thousand, one hundred forty-two".