663255123531 has 32 divisors (see below), whose sum is σ = 1187365820928. Its totient is φ = 318044413440.

The previous prime is 663255123499. The next prime is 663255123547. The reversal of 663255123531 is 135321552366.

It is not a de Polignac number, because 663255123531 - 2⁵ = 663255123499 is a prime.

It is a super-2 number, since 2×663255123531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663255123031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110429086 + ... + 110435091.

It is an arithmetic number, because the mean of its divisors is an integer number (37105181904).

Almost surely, 2^663255123531 is an apocalyptic number.

663255123531 is a deficient number, since it is larger than the sum of its proper divisors (524110697397).

663255123531 is a wasteful number, since it uses less digits than its factorization.

663255123531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220864211.

The product of its digits is 486000, while the sum is 42.

Adding to 663255123531 its reverse (135321552366), we get a palindrome (798576675897).

The spelling of 663255123531 in words is "six hundred sixty-three billion, two hundred fifty-five million, one hundred twenty-three thousand, five hundred thirty-one".