205156155 has 8 divisors (see below), whose sum is σ = 328249872. Its totient is φ = 109416608.

The previous prime is 205156151. The next prime is 205156177. The reversal of 205156155 is 551651502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205156155 - 2² = 205156151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205156151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6838524 + ... + 6838553.

It is an arithmetic number, because the mean of its divisors is an integer number (41031234).

Almost surely, 2^205156155 is an apocalyptic number.

205156155 is a deficient number, since it is larger than the sum of its proper divisors (123093717).

205156155 is a wasteful number, since it uses less digits than its factorization.

205156155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13677085.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 205156155 is about 14323.2731943505. The cubic root of 205156155 is about 589.7865310281.

The spelling of 205156155 in words is "two hundred five million, one hundred fifty-six thousand, one hundred fifty-five".