163557897 has 16 divisors (see below), whose sum is σ = 227068800. Its totient is φ = 104630400.

The previous prime is 163557893. The next prime is 163557913. The reversal of 163557897 is 798755361.

It is not a de Polignac number, because 163557897 - 2² = 163557893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163557893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3397 + ... + 18402.

It is an arithmetic number, because the mean of its divisors is an integer number (14191800).

Almost surely, 2^163557897 is an apocalyptic number.

It is an amenable number.

163557897 is a deficient number, since it is larger than the sum of its proper divisors (63510903).

163557897 is a wasteful number, since it uses less digits than its factorization.

163557897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21904.

The product of its digits is 1587600, while the sum is 51.

The square root of 163557897 is about 12788.9756040114. The cubic root of 163557897 is about 546.8780669521.

The spelling of 163557897 in words is "one hundred sixty-three million, five hundred fifty-seven thousand, eight hundred ninety-seven".