11731581981795 has 64 divisors (see below), whose sum is σ = 21208570564608. Its totient is φ = 5497612992000.

The previous prime is 11731581981787. The next prime is 11731581981799. The reversal of 11731581981795 is 59718918513711.

It is not a de Polignac number, because 11731581981795 - 2³ = 11731581981787 is a prime.

It is a super-2 number, since 2×11731581981795² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11731581981799) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 15538701 + ... + 16276190.

It is an arithmetic number, because the mean of its divisors is an integer number (331383915072).

Almost surely, 2^{11731581981795} is an apocalyptic number.

11731581981795 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11731581981795 is a deficient number, since it is larger than the sum of its proper divisors (9476988582813).

11731581981795 is a wasteful number, since it uses less digits than its factorization.

11731581981795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31815004.

The product of its digits is 19051200, while the sum is 66.

The spelling of 11731581981795 in words is "eleven trillion, seven hundred thirty-one billion, five hundred eighty-one million, nine hundred eighty-one thousand, seven hundred ninety-five".