205015155 has 24 divisors (see below), whose sum is σ = 348462192. Its totient is φ = 102907392.

The previous prime is 205015133. The next prime is 205015163. The reversal of 205015155 is 551510502.

It is not a de Polignac number, because 205015155 - 2⁹ = 205014643 is a prime.

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, 19312 + ... + 27981.

It is an arithmetic number, because the mean of its divisors is an integer number (14519258).

Almost surely, 2^205015155 is an apocalyptic number.

205015155 is a deficient number, since it is larger than the sum of its proper divisors (143447037).

205015155 is a wasteful number, since it uses less digits than its factorization.

205015155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47335 (or 47318 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 205015155 is about 14318.3502890522. The cubic root of 205015155 is about 589.6513836333.

Adding to 205015155 its reverse (551510502), we get a palindrome (756525657).

It can be divided in two parts, 2050 and 15155, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 205015155 in words is "two hundred five million, fifteen thousand, one hundred fifty-five".