131565727666 has 8 divisors (see below), whose sum is σ = 200051997084. Its totient is φ = 64881728640.

The previous prime is 131565727523. The next prime is 131565727673. The reversal of 131565727666 is 666727565131.

It can be written as a sum of positive squares in 2 ways, for example, as 131511396025 + 54331641 = 362645^2 + 7371^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450567415 + ... + 450567706.

Almost surely, 2^131565727666 is an apocalyptic number.

131565727666 is a deficient number, since it is larger than the sum of its proper divisors (68486269418).

131565727666 is an equidigital number, since it uses as much as digits as its factorization.

131565727666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901135196.

The product of its digits is 9525600, while the sum is 55.

The spelling of 131565727666 in words is "one hundred thirty-one billion, five hundred sixty-five million, seven hundred twenty-seven thousand, six hundred sixty-six".