663781007 has 2 divisors, whose sum is σ = 663781008. Its totient is φ = 663781006.

The previous prime is 663780983. The next prime is 663781009. The reversal of 663781007 is 700187366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663781007 is a prime.

Together with 663781009, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663781009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331890503 + 331890504.

It is an arithmetic number, because the mean of its divisors is an integer number (331890504).

Almost surely, 2^663781007 is an apocalyptic number.

663781007 is a deficient number, since it is larger than the sum of its proper divisors (1).

663781007 is an equidigital number, since it uses as much as digits as its factorization.

663781007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 663781007 is about 25763.9478147275. The cubic root of 663781007 is about 872.3182138111.

The spelling of 663781007 in words is "six hundred sixty-three million, seven hundred eighty-one thousand, seven".