663384772121 has 4 divisors (see below), whose sum is σ = 663523357392. Its totient is φ = 663246186852.

The previous prime is 663384772103. The next prime is 663384772129. The reversal of 663384772121 is 121277483366.

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 663384772121 - 2³⁸ = 388506865177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663384772121.

It is not an unprimeable number, because it can be changed into a prime (663384772129) 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, 69285455 + ... + 69295028.

It is an arithmetic number, because the mean of its divisors is an integer number (165880839348).

Almost surely, 2^663384772121 is an apocalyptic number.

It is an amenable number.

663384772121 is a deficient number, since it is larger than the sum of its proper divisors (138585271).

663384772121 is a wasteful number, since it uses less digits than its factorization.

663384772121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138585270.

The product of its digits is 2032128, while the sum is 50.

The spelling of 663384772121 in words is "six hundred sixty-three billion, three hundred eighty-four million, seven hundred seventy-two thousand, one hundred twenty-one".