640230163 has 8 divisors (see below), whose sum is σ = 644403200. Its totient is φ = 636067080.

The previous prime is 640230127. The next prime is 640230169. The reversal of 640230163 is 361032046.

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 640230163 - 2⁹ = 640229651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640230169) 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, 159406 + ... + 163372.

It is an arithmetic number, because the mean of its divisors is an integer number (80550400).

Almost surely, 2^640230163 is an apocalyptic number.

640230163 is a deficient number, since it is larger than the sum of its proper divisors (4173037).

640230163 is a wasteful number, since it uses less digits than its factorization.

640230163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4977.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 640230163 is about 25302.7698681389. The cubic root of 640230163 is about 861.8771701211.

The spelling of 640230163 in words is "six hundred forty million, two hundred thirty thousand, one hundred sixty-three".