111945201681 has 8 divisors (see below), whose sum is σ = 149522591520. Its totient is φ = 74498973152.

The previous prime is 111945201677. The next prime is 111945201703. The reversal of 111945201681 is 186102549111.

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

It is a cyclic number.

It is not a de Polignac number, because 111945201681 - 2² = 111945201677 is a prime.

It is a super-2 number, since 2×111945201681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111945201581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32788335 + ... + 32791748.

It is an arithmetic number, because the mean of its divisors is an integer number (18690323940).

Almost surely, 2^111945201681 is an apocalyptic number.

It is an amenable number.

111945201681 is a deficient number, since it is larger than the sum of its proper divisors (37577389839).

111945201681 is an equidigital number, since it uses as much as digits as its factorization.

111945201681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65580655.

The product of its (nonzero) digits is 17280, while the sum is 39.

The spelling of 111945201681 in words is "one hundred eleven billion, nine hundred forty-five million, two hundred one thousand, six hundred eighty-one".