131666664786 has 16 divisors (see below), whose sum is σ = 264092219424. Its totient is φ = 43762406624.

The previous prime is 131666664763. The next prime is 131666664799. The reversal of 131666664786 is 687466666131.

It is a happy number.

It is a super-2 number, since 2×131666664786² (a number of 23 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 31618155 + ... + 31622318.

It is an arithmetic number, because the mean of its divisors is an integer number (16505763714).

Almost surely, 2^131666664786 is an apocalyptic number.

131666664786 is an abundant number, since it is smaller than the sum of its proper divisors (132425554638).

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

131666664786 is a wasteful number, since it uses less digits than its factorization.

131666664786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63240825.

The product of its digits is 31352832, while the sum is 60.

The spelling of 131666664786 in words is "one hundred thirty-one billion, six hundred sixty-six million, six hundred sixty-four thousand, seven hundred eighty-six".