131564645620 has 24 divisors (see below), whose sum is σ = 276300081288. Its totient is φ = 52623129600.

The previous prime is 131564645599. The next prime is 131564645629. The reversal of 131564645620 is 26546465131.

It can be written as a sum of positive squares in 4 ways, for example, as 12895419364 + 118669226256 = 113558^2 + 344484^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131564645629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250140 + ... + 570700.

It is an arithmetic number, because the mean of its divisors is an integer number (11512503387).

Almost surely, 2^131564645620 is an apocalyptic number.

131564645620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131564645620 is an abundant number, since it is smaller than the sum of its proper divisors (144735435668).

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

131564645620 is a wasteful number, since it uses less digits than its factorization.

131564645620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341091 (or 341089 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 131564645620 in words is "one hundred thirty-one billion, five hundred sixty-four million, six hundred forty-five thousand, six hundred twenty".