531660520729 has 6 divisors (see below), whose sum is σ = 575703404286. Its totient is φ = 490763557440.

The previous prime is 531660520697. The next prime is 531660520733. The reversal of 531660520729 is 927025066135.

It can be written as a sum of positive squares in 3 ways, for example, as 39736435600 + 491924085129 = 199340^2 + 701373^2 .

It is not a de Polignac number, because 531660520729 - 2⁵ = 531660520697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531660520759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1572959952 + ... + 1572960289.

It is an arithmetic number, because the mean of its divisors is an integer number (95950567381).

Almost surely, 2^531660520729 is an apocalyptic number.

It is an amenable number.

531660520729 is a deficient number, since it is larger than the sum of its proper divisors (44042883557).

531660520729 is a wasteful number, since it uses less digits than its factorization.

531660520729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145920267 (or 3145920254 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 531660520729 in words is "five hundred thirty-one billion, six hundred sixty million, five hundred twenty thousand, seven hundred twenty-nine".