531661271511 has 24 divisors (see below), whose sum is σ = 741166301680. Its totient is φ = 338973820416.

The previous prime is 531661271473. The next prime is 531661271513. The reversal of 531661271511 is 115172166135.

It is not a de Polignac number, because 531661271511 - 2⁹ = 531661270999 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 531661271511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531661271513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10813095 + ... + 10862151.

Almost surely, 2^531661271511 is an apocalyptic number.

531661271511 is a deficient number, since it is larger than the sum of its proper divisors (209505030169).

531661271511 is a wasteful number, since it uses less digits than its factorization.

531661271511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55935 (or 55912 counting only the distinct ones).

The product of its digits is 37800, while the sum is 39.

The spelling of 531661271511 in words is "five hundred thirty-one billion, six hundred sixty-one million, two hundred seventy-one thousand, five hundred eleven".