131781783721662 has 320 divisors, whose sum is σ = 327680204544000. Its totient is φ = 39394828182528.

The previous prime is 131781783721619. The next prime is 131781783721667. The reversal of 131781783721662 is 266127387187131.

131781783721662 is a `hidden beast` number, since 1 + 31 + 7 + 8 + 1 + 78 + 372 + 166 + 2 = 666.

131781783721662 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 131781783721662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131781783721667) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 23843272743 + ... + 23843278269.

It is an arithmetic number, because the mean of its divisors is an integer number (1024000639200).

Almost surely, 2^{131781783721662} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131781783721662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163840102272000).

131781783721662 is an abundant number, since it is smaller than the sum of its proper divisors (195898420822338).

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

131781783721662 is a wasteful number, since it uses less digits than its factorization.

131781783721662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9445 (or 9436 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The spelling of 131781783721662 in words is "one hundred thirty-one trillion, seven hundred eighty-one billion, seven hundred eighty-three million, seven hundred twenty-one thousand, six hundred sixty-two".