131220181718 has 8 divisors (see below), whose sum is σ = 197286956640. Its totient is φ = 65457862840.

The previous prime is 131220181711. The next prime is 131220181727. The reversal of 131220181718 is 817181022131.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220181711) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 76112933 + ... + 76114656.

It is an arithmetic number, because the mean of its divisors is an integer number (24660869580).

Almost surely, 2^131220181718 is an apocalyptic number.

131220181718 is a deficient number, since it is larger than the sum of its proper divisors (66066774922).

131220181718 is a wasteful number, since it uses less digits than its factorization.

131220181718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152228022.

The product of its (nonzero) digits is 5376, while the sum is 35.

The spelling of 131220181718 in words is "one hundred thirty-one billion, two hundred twenty million, one hundred eighty-one thousand, seven hundred eighteen".