111818537481 has 32 divisors (see below), whose sum is σ = 174482329600. Its totient is φ = 63670359312.

The previous prime is 111818537461. The next prime is 111818537483. The reversal of 111818537481 is 184735818111.

It is not a de Polignac number, because 111818537481 - 2⁷ = 111818537353 is a prime.

It is a super-2 number, since 2×111818537481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111818537481.

It is not an unprimeable number, because it can be changed into a prime (111818537483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99216 + ... + 483198.

It is an arithmetic number, because the mean of its divisors is an integer number (5452572800).

Almost surely, 2^111818537481 is an apocalyptic number.

It is an amenable number.

111818537481 is a deficient number, since it is larger than the sum of its proper divisors (62663792119).

111818537481 is an equidigital number, since it uses as much as digits as its factorization.

111818537481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384290 (or 384276 counting only the distinct ones).

The product of its digits is 215040, while the sum is 48.

The spelling of 111818537481 in words is "one hundred eleven billion, eight hundred eighteen million, five hundred thirty-seven thousand, four hundred eighty-one".