131218115745 has 16 divisors (see below), whose sum is σ = 211237019712. Its totient is φ = 69553650240.

The previous prime is 131218115731. The next prime is 131218115773. The reversal of 131218115745 is 547511812131.

It is not a de Polignac number, because 131218115745 - 2⁹ = 131218115233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26831526 + ... + 26836415.

It is an arithmetic number, because the mean of its divisors is an integer number (13202313732).

Almost surely, 2^131218115745 is an apocalyptic number.

131218115745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131218115745 is a deficient number, since it is larger than the sum of its proper divisors (80018903967).

131218115745 is a wasteful number, since it uses less digits than its factorization.

131218115745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53668112.

The product of its digits is 33600, while the sum is 39.

Adding to 131218115745 its reverse (547511812131), we get a palindrome (678729927876).

The spelling of 131218115745 in words is "one hundred thirty-one billion, two hundred eighteen million, one hundred fifteen thousand, seven hundred forty-five".