320501663 has 4 divisors (see below), whose sum is σ = 339354720. Its totient is φ = 301648608.

The previous prime is 320501651. The next prime is 320501683. The reversal of 320501663 is 366105023.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 320501663 - 2¹⁴ = 320485279 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 (320501603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9426503 + ... + 9426536.

It is an arithmetic number, because the mean of its divisors is an integer number (84838680).

Almost surely, 2^320501663 is an apocalyptic number.

320501663 is a deficient number, since it is larger than the sum of its proper divisors (18853057).

320501663 is a wasteful number, since it uses less digits than its factorization.

320501663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18853056.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 320501663 is about 17902.5602358992. The cubic root of 320501663 is about 684.3476219124.

Adding to 320501663 its reverse (366105023), we get a palindrome (686606686).

The spelling of 320501663 in words is "three hundred twenty million, five hundred one thousand, six hundred sixty-three".