111644021656 has 32 divisors (see below), whose sum is σ = 212014425600. Its totient is φ = 55107056160.

The previous prime is 111644021609. The next prime is 111644021683. The reversal of 111644021656 is 656120446111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7489971 + ... + 7504861.

It is an arithmetic number, because the mean of its divisors is an integer number (6625450800).

Almost surely, 2^111644021656 is an apocalyptic number.

It is an amenable number.

111644021656 is a deficient number, since it is larger than the sum of its proper divisors (100370403944).

111644021656 is a wasteful number, since it uses less digits than its factorization.

111644021656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26839 (or 26835 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

Adding to 111644021656 its reverse (656120446111), we get a palindrome (767764467767).

The spelling of 111644021656 in words is "one hundred eleven billion, six hundred forty-four million, twenty-one thousand, six hundred fifty-six".