131661818544 has 80 divisors (see below), whose sum is σ = 341194804992. Its totient is φ = 43749598464.

The previous prime is 131661818527. The next prime is 131661818611. The reversal of 131661818544 is 445818166131.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 131661818493 and 131661818502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34169322 + ... + 34173174.

Almost surely, 2^131661818544 is an apocalyptic number.

It is an amenable number.

131661818544 is an abundant number, since it is smaller than the sum of its proper divisors (209532986448).

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

131661818544 is a wasteful number, since it uses less digits than its factorization.

131661818544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5914 (or 5908 counting only the distinct ones).

The product of its digits is 552960, while the sum is 48.

The spelling of 131661818544 in words is "one hundred thirty-one billion, six hundred sixty-one million, eight hundred eighteen thousand, five hundred forty-four".