131644405640 has 32 divisors (see below), whose sum is σ = 323127178560. Its totient is φ = 47870692800.

The previous prime is 131644405609. The next prime is 131644405687. The reversal of 131644405640 is 46504446131.

It is a junction number, because it is equal to n+sod(n) for n = 131644405594 and 131644405603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149595476 + ... + 149596355.

It is an arithmetic number, because the mean of its divisors is an integer number (10097724330).

Almost surely, 2^131644405640 is an apocalyptic number.

131644405640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131644405640 is an abundant number, since it is smaller than the sum of its proper divisors (191482772920).

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

131644405640 is a wasteful number, since it uses less digits than its factorization.

131644405640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299191853 (or 299191849 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 131644405640 in words is "one hundred thirty-one billion, six hundred forty-four million, four hundred five thousand, six hundred forty".