131566866 has 8 divisors (see below), whose sum is σ = 263133744. Its totient is φ = 43855620.

The previous prime is 131566847. The next prime is 131566867. The reversal of 131566866 is 668665131.

It is a sphenic number, since it is the product of 3 distinct primes.

131566866 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (131566867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10963900 + ... + 10963911.

It is an arithmetic number, because the mean of its divisors is an integer number (32891718).

Almost surely, 2^131566866 is an apocalyptic number.

131566866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

131566866 is a wasteful number, since it uses less digits than its factorization.

131566866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21927816.

The product of its digits is 155520, while the sum is 42.

The square root of 131566866 is about 11470.2600667988. The cubic root of 131566866 is about 508.6068166546.

The spelling of 131566866 in words is "one hundred thirty-one million, five hundred sixty-six thousand, eight hundred sixty-six".