663134124421 has 4 divisors (see below), whose sum is σ = 663152474700. Its totient is φ = 663115774144.

The previous prime is 663134124409. The next prime is 663134124467. The reversal of 663134124421 is 124421431366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68492647521 + 594641476900 = 261711^2 + 771130^2 .

It is a cyclic number.

It is not a de Polignac number, because 663134124421 - 2²¹ = 663132027269 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 (663134124721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9120826 + ... + 9193243.

It is an arithmetic number, because the mean of its divisors is an integer number (165788118675).

Almost surely, 2^663134124421 is an apocalyptic number.

It is an amenable number.

663134124421 is a deficient number, since it is larger than the sum of its proper divisors (18350279).

663134124421 is a wasteful number, since it uses less digits than its factorization.

663134124421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18350278.

The product of its digits is 82944, while the sum is 37.

Adding to 663134124421 its reverse (124421431366), we get a palindrome (787555555787).

The spelling of 663134124421 in words is "six hundred sixty-three billion, one hundred thirty-four million, one hundred twenty-four thousand, four hundred twenty-one".