131566566 has 8 divisors (see below), whose sum is σ = 263133144. Its totient is φ = 43855520.

The previous prime is 131566559. The next prime is 131566571. The reversal of 131566566 is 665665131.

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

131566566 is an admirable number.

It is a super-2 number, since 2×131566566² = 34619522578064712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10963875 + ... + 10963886.

It is an arithmetic number, because the mean of its divisors is an integer number (32891643).

Almost surely, 2^131566566 is an apocalyptic number.

131566566 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.

131566566 is a wasteful number, since it uses less digits than its factorization.

131566566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21927766.

The product of its digits is 97200, while the sum is 39.

The square root of 131566566 is about 11470.2469894942. The cubic root of 131566566 is about 508.6064300776.

The spelling of 131566566 in words is "one hundred thirty-one million, five hundred sixty-six thousand, five hundred sixty-six".