111561501640 has 64 divisors (see below), whose sum is σ = 258113583360. Its totient is φ = 43365300480.

The previous prime is 111561501619. The next prime is 111561501647. The reversal of 111561501640 is 46105165111.

It is not an unprimeable number, because it can be changed into a prime (111561501647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1172245 + ... + 1263835.

It is an arithmetic number, because the mean of its divisors is an integer number (4033024740).

Almost surely, 2^111561501640 is an apocalyptic number.

111561501640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111561501640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129056791680).

111561501640 is an abundant number, since it is smaller than the sum of its proper divisors (146552081720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111561501640 is a wasteful number, since it uses less digits than its factorization.

111561501640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92462 (or 92458 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

Adding to 111561501640 its reverse (46105165111), we get a palindrome (157666666751).

The spelling of 111561501640 in words is "one hundred eleven billion, five hundred sixty-one million, five hundred one thousand, six hundred forty".