205140523420415 has 24 divisors (see below), whose sum is σ = 270587935739520. Its totient is φ = 149189860339520.

The previous prime is 205140523420409. The next prime is 205140523420463. The reversal of 205140523420415 is 514024325041502.

It is not a de Polignac number, because 205140523420415 - 2¹² = 205140523416319 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24301202 + ... + 31635888.

It is an arithmetic number, because the mean of its divisors is an integer number (11274497322480).

Almost surely, 2^{205140523420415} is an apocalyptic number.

205140523420415 is a deficient number, since it is larger than the sum of its proper divisors (65447412319105).

205140523420415 is a wasteful number, since it uses less digits than its factorization.

205140523420415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7380943 (or 7380932 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 38.

Adding to 205140523420415 its reverse (514024325041502), we get a palindrome (719164848461917).

The spelling of 205140523420415 in words is "two hundred five trillion, one hundred forty billion, five hundred twenty-three million, four hundred twenty thousand, four hundred fifteen".