663879247 has 4 divisors (see below), whose sum is σ = 698820280. Its totient is φ = 628938216.

The previous prime is 663879241. The next prime is 663879283. The reversal of 663879247 is 742978366.

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 663879247 - 2⁷ = 663879119 is a prime.

It is a super-3 number, since 3×663879247³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663879194 and 663879203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663879241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17470488 + ... + 17470525.

It is an arithmetic number, because the mean of its divisors is an integer number (174705070).

Almost surely, 2^663879247 is an apocalyptic number.

663879247 is a deficient number, since it is larger than the sum of its proper divisors (34941033).

663879247 is a wasteful number, since it uses less digits than its factorization.

663879247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34941032.

The product of its digits is 3048192, while the sum is 52.

The square root of 663879247 is about 25765.8542843043. The cubic root of 663879247 is about 872.3612462334.

The spelling of 663879247 in words is "six hundred sixty-three million, eight hundred seventy-nine thousand, two hundred forty-seven".