111516505661 has 8 divisors (see below), whose sum is σ = 121714411104. Its totient is φ = 101328607120.

The previous prime is 111516505643. The next prime is 111516505673. The reversal of 111516505661 is 166505615111.

It is a happy number.

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 111516505661 - 2¹⁰ = 111516504637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111510505661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2478410 + ... + 2523003.

It is an arithmetic number, because the mean of its divisors is an integer number (15214301388).

Almost surely, 2^111516505661 is an apocalyptic number.

111516505661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111516505661 is a deficient number, since it is larger than the sum of its proper divisors (10197905443).

111516505661 is a wasteful number, since it uses less digits than its factorization.

111516505661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003451.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 111516505661 in words is "one hundred eleven billion, five hundred sixteen million, five hundred five thousand, six hundred sixty-one".