663123749 has 4 divisors (see below), whose sum is σ = 663846240. Its totient is φ = 662401260.

The previous prime is 663123707. The next prime is 663123779. The reversal of 663123749 is 947321366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663123749 - 2⁸ = 663123493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663123779) 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, 359867 + ... + 361704.

It is an arithmetic number, because the mean of its divisors is an integer number (165961560).

Almost surely, 2^663123749 is an apocalyptic number.

It is an amenable number.

663123749 is a deficient number, since it is larger than the sum of its proper divisors (722491).

663123749 is an equidigital number, since it uses as much as digits as its factorization.

663123749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722490.

The product of its digits is 163296, while the sum is 41.

The square root of 663123749 is about 25751.1892735073. The cubic root of 663123749 is about 872.0302034295.

The spelling of 663123749 in words is "six hundred sixty-three million, one hundred twenty-three thousand, seven hundred forty-nine".