105515111661 has 8 divisors (see below), whose sum is σ = 140738004000. Its totient is φ = 70317813552.

The previous prime is 105515111659. The next prime is 105515111687. The reversal of 105515111661 is 166111515501.

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

It is not a de Polignac number, because 105515111661 - 2¹ = 105515111659 is a prime.

It is a super-2 number, since 2×105515111661² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105515111621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6388935 + ... + 6405428.

It is an arithmetic number, because the mean of its divisors is an integer number (17592250500).

Almost surely, 2^105515111661 is an apocalyptic number.

It is an amenable number.

105515111661 is a deficient number, since it is larger than the sum of its proper divisors (35222892339).

105515111661 is a wasteful number, since it uses less digits than its factorization.

105515111661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12797115.

The product of its (nonzero) digits is 4500, while the sum is 33.

The spelling of 105515111661 in words is "one hundred five billion, five hundred fifteen million, one hundred eleven thousand, six hundred sixty-one".