663506347 has 4 divisors (see below), whose sum is σ = 758292976. Its totient is φ = 568719720.

The previous prime is 663506309. The next prime is 663506357. The reversal of 663506347 is 743605366.

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 663506347 - 2⁷ = 663506219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663506357) 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, 47393304 + ... + 47393317.

It is an arithmetic number, because the mean of its divisors is an integer number (189573244).

Almost surely, 2^663506347 is an apocalyptic number.

663506347 is a deficient number, since it is larger than the sum of its proper divisors (94786629).

663506347 is an equidigital number, since it uses as much as digits as its factorization.

663506347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94786628.

The product of its (nonzero) digits is 272160, while the sum is 40.

The square root of 663506347 is about 25758.6169465676. The cubic root of 663506347 is about 872.1978809645.

The spelling of 663506347 in words is "six hundred sixty-three million, five hundred six thousand, three hundred forty-seven".