531661241118 has 64 divisors (see below), whose sum is σ = 1287576276480. Its totient is φ = 142871427072.

The previous prime is 531661241029. The next prime is 531661241119. The reversal of 531661241118 is 811142166135.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531661241119) 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, 813105 + ... + 1313187.

It is an arithmetic number, because the mean of its divisors is an integer number (20118379320).

Almost surely, 2^531661241118 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531661241118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (643788138240).

531661241118 is an abundant number, since it is smaller than the sum of its proper divisors (755915035362).

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

531661241118 is a wasteful number, since it uses less digits than its factorization.

531661241118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501601.

The product of its digits is 34560, while the sum is 39.

The spelling of 531661241118 in words is "five hundred thirty-one billion, six hundred sixty-one million, two hundred forty-one thousand, one hundred eighteen".