663724447 has 2 divisors, whose sum is σ = 663724448. Its totient is φ = 663724446.

The previous prime is 663724433. The next prime is 663724487. The reversal of 663724447 is 744427366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663724447 - 2¹¹ = 663722399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663724417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331862223 + 331862224.

It is an arithmetic number, because the mean of its divisors is an integer number (331862224).

Almost surely, 2^663724447 is an apocalyptic number.

663724447 is a deficient number, since it is larger than the sum of its proper divisors (1).

663724447 is an equidigital number, since it uses as much as digits as its factorization.

663724447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 43.

The square root of 663724447 is about 25762.8501334771. The cubic root of 663724447 is about 872.2934367038.

The spelling of 663724447 in words is "six hundred sixty-three million, seven hundred twenty-four thousand, four hundred forty-seven".