663384772123 has 4 divisors (see below), whose sum is σ = 674628581880. Its totient is φ = 652140962368.

The previous prime is 663384772103. The next prime is 663384772129. The reversal of 663384772123 is 321277483366.

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 663384772123 - 2²¹ = 663382674971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663384772129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5621904790 + ... + 5621904907.

It is an arithmetic number, because the mean of its divisors is an integer number (168657145470).

Almost surely, 2^663384772123 is an apocalyptic number.

663384772123 is a deficient number, since it is larger than the sum of its proper divisors (11243809757).

663384772123 is a wasteful number, since it uses less digits than its factorization.

663384772123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11243809756.

The product of its digits is 6096384, while the sum is 52.

The spelling of 663384772123 in words is "six hundred sixty-three billion, three hundred eighty-four million, seven hundred seventy-two thousand, one hundred twenty-three".