531163207644 has 24 divisors (see below), whose sum is σ = 1242650962560. Its totient is φ = 176587239024.

The previous prime is 531163207637. The next prime is 531163207657. The reversal of 531163207644 is 446702361135.

It is a junction number, because it is equal to n+sod(n) for n = 531163207596 and 531163207605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58390704 + ... + 58399799.

It is an arithmetic number, because the mean of its divisors is an integer number (51777123440).

Almost surely, 2^531163207644 is an apocalyptic number.

It is an amenable number.

531163207644 is an abundant number, since it is smaller than the sum of its proper divisors (711487754916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531163207644 is a wasteful number, since it uses less digits than its factorization.

531163207644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116790889 (or 116790887 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

Adding to 531163207644 its reverse (446702361135), we get a palindrome (977865568779).

The spelling of 531163207644 in words is "five hundred thirty-one billion, one hundred sixty-three million, two hundred seven thousand, six hundred forty-four".