163205725 has 12 divisors (see below), whose sum is σ = 213027040. Its totient is φ = 123692400.

The previous prime is 163205719. The next prime is 163205747. The reversal of 163205725 is 527502361.

It is not a de Polignac number, because 163205725 - 2¹³ = 163197533 is a prime.

It is a super-2 number, since 2×163205725² = 53272217345551250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171321 + ... + 172270.

Almost surely, 2^163205725 is an apocalyptic number.

It is an amenable number.

163205725 is a deficient number, since it is larger than the sum of its proper divisors (49821315).

163205725 is a wasteful number, since it uses less digits than its factorization.

163205725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343620 (or 343615 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 163205725 is about 12775.1996070512. The cubic root of 163205725 is about 546.4852732414.

The spelling of 163205725 in words is "one hundred sixty-three million, two hundred five thousand, seven hundred twenty-five".