111155616661 has 8 divisors (see below), whose sum is σ = 111519528120. Its totient is φ = 110791789248.

The previous prime is 111155616659. The next prime is 111155616701. The reversal of 111155616661 is 166616551111.

It can be written as a sum of positive squares in 4 ways, for example, as 40872304561 + 70283312100 = 202169^2 + 265110^2 .

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 111155616661 - 2¹ = 111155616659 is a prime.

It is a super-2 number, since 2×111155616661² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111155616461) 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, 3686595 + ... + 3716623.

It is an arithmetic number, because the mean of its divisors is an integer number (13939941015).

Almost surely, 2^111155616661 is an apocalyptic number.

It is an amenable number.

111155616661 is a deficient number, since it is larger than the sum of its proper divisors (363911459).

111155616661 is a wasteful number, since it uses less digits than its factorization.

111155616661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42023.

The product of its digits is 32400, while the sum is 40.

The spelling of 111155616661 in words is "one hundred eleven billion, one hundred fifty-five million, six hundred sixteen thousand, six hundred sixty-one".