205170157 has 8 divisors (see below), whose sum is σ = 217182240. Its totient is φ = 193487280.

The previous prime is 205170139. The next prime is 205170209. The reversal of 205170157 is 751071502.

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 205170157 - 2⁷ = 205170029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205170137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81019 + ... + 83512.

It is an arithmetic number, because the mean of its divisors is an integer number (27147780).

Almost surely, 2^205170157 is an apocalyptic number.

It is an amenable number.

205170157 is a deficient number, since it is larger than the sum of its proper divisors (12012083).

205170157 is a wasteful number, since it uses less digits than its factorization.

205170157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164603.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 205170157 is about 14323.7619709349. The cubic root of 205170157 is about 589.7999484550.

The spelling of 205170157 in words is "two hundred five million, one hundred seventy thousand, one hundred fifty-seven".