663923953 has 16 divisors (see below), whose sum is σ = 828334080. Its totient is φ = 516978000.

The previous prime is 663923917. The next prime is 663923963. The reversal of 663923953 is 359329366.

It is not a de Polignac number, because 663923953 - 2¹³ = 663915761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663923903) 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, 170478 + ... + 174328.

It is an arithmetic number, because the mean of its divisors is an integer number (51770880).

Almost surely, 2^663923953 is an apocalyptic number.

It is an amenable number.

663923953 is a deficient number, since it is larger than the sum of its proper divisors (164410127).

663923953 is a wasteful number, since it uses less digits than its factorization.

663923953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6108.

The product of its digits is 787320, while the sum is 46.

The square root of 663923953 is about 25766.7218132226. The cubic root of 663923953 is about 872.3808275587.

The spelling of 663923953 in words is "six hundred sixty-three million, nine hundred twenty-three thousand, nine hundred fifty-three".