663663013432431 has 64 divisors (see below), whose sum is σ = 985595953545216. Its totient is φ = 395084271859200.

The previous prime is 663663013432421. The next prime is 663663013432493. The reversal of 663663013432431 is 134234310366366.

663663013432431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 663663013432431 - 2¹³ = 663663013424239 is a prime.

It is a super-2 number, since 2×663663013432431² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663663013432421) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 653624376 + ... + 654638946.

It is an arithmetic number, because the mean of its divisors is an integer number (15399936774144).

Almost surely, 2^{663663013432431} is an apocalyptic number.

663663013432431 is a deficient number, since it is larger than the sum of its proper divisors (321932940112785).

663663013432431 is a wasteful number, since it uses less digits than its factorization.

663663013432431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019132.

The product of its (nonzero) digits is 10077696, while the sum is 51.

Adding to 663663013432431 its reverse (134234310366366), we get a palindrome (797897323798797).

The spelling of 663663013432431 in words is "six hundred sixty-three trillion, six hundred sixty-three billion, thirteen million, four hundred thirty-two thousand, four hundred thirty-one".