131555332566 has 24 divisors (see below), whose sum is σ = 325756061904. Its totient is φ = 37587237840.

The previous prime is 131555332547. The next prime is 131555332583. The reversal of 131555332566 is 665233555131.

131555332566 is a `hidden beast` number, since 1 + 3 + 1 + 5 + 5 + 53 + 32 + 566 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522044845 + ... + 522045096.

It is an arithmetic number, because the mean of its divisors is an integer number (13573169246).

Almost surely, 2^131555332566 is an apocalyptic number.

131555332566 is an abundant number, since it is smaller than the sum of its proper divisors (194200729338).

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

131555332566 is a wasteful number, since it uses less digits than its factorization.

131555332566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044089956 (or 1044089953 counting only the distinct ones).

The product of its digits is 1215000, while the sum is 45.

Adding to 131555332566 its reverse (665233555131), we get a palindrome (796788887697).

The spelling of 131555332566 in words is "one hundred thirty-one billion, five hundred fifty-five million, three hundred thirty-two thousand, five hundred sixty-six".