663618949 has 8 divisors (see below), whose sum is σ = 758782080. Its totient is φ = 568545936.

The previous prime is 663618941. The next prime is 663618959. The reversal of 663618949 is 949816366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663618949 - 2³ = 663618941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 663618896 and 663618905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663618941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5929 + ... + 36910.

It is an arithmetic number, because the mean of its divisors is an integer number (94847760).

Almost surely, 2^663618949 is an apocalyptic number.

It is an amenable number.

663618949 is a deficient number, since it is larger than the sum of its proper divisors (95163131).

663618949 is a wasteful number, since it uses less digits than its factorization.

663618949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45059.

The product of its digits is 1679616, while the sum is 52.

The square root of 663618949 is about 25760.8025690195. The cubic root of 663618949 is about 872.2472176795.

The spelling of 663618949 in words is "six hundred sixty-three million, six hundred eighteen thousand, nine hundred forty-nine".