163390257 has 16 divisors (see below), whose sum is σ = 242679360. Its totient is φ = 108648000.

The previous prime is 163390223. The next prime is 163390273. The reversal of 163390257 is 752093361.

163390257 is a `hidden beast` number, since 16 + 3 + 390 + 257 = 666.

163390257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 163390257 - 2⁶ = 163390193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163390277) 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, 3282 + ... + 18372.

It is an arithmetic number, because the mean of its divisors is an integer number (15167460).

Almost surely, 2^163390257 is an apocalyptic number.

It is an amenable number.

163390257 is a deficient number, since it is larger than the sum of its proper divisors (79289103).

163390257 is a wasteful number, since it uses less digits than its factorization.

163390257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15501 (or 15495 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 163390257 is about 12782.4198413289. The cubic root of 163390257 is about 546.6911607027.

The spelling of 163390257 in words is "one hundred sixty-three million, three hundred ninety thousand, two hundred fifty-seven".