663605723 has 12 divisors (see below), whose sum is σ = 764045208. Its totient is φ = 571523040.

The previous prime is 663605717. The next prime is 663605743. The reversal of 663605723 is 327506366.

It is not a de Polignac number, because 663605723 - 2¹⁸ = 663343579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663605743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79586 + ... + 87527.

It is an arithmetic number, because the mean of its divisors is an integer number (63670434).

Almost surely, 2^663605723 is an apocalyptic number.

663605723 is a deficient number, since it is larger than the sum of its proper divisors (100439485).

663605723 is a wasteful number, since it uses less digits than its factorization.

663605723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167162 (or 167143 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 38.

The square root of 663605723 is about 25760.5458598998. The cubic root of 663605723 is about 872.2414229794.

The spelling of 663605723 in words is "six hundred sixty-three million, six hundred five thousand, seven hundred twenty-three".