2111665215055 has 8 divisors (see below), whose sum is σ = 2764361736144. Its totient is φ = 1535756520000.

The previous prime is 2111665215029. The next prime is 2111665215059. The reversal of 2111665215055 is 5505125661112.

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

It is not a de Polignac number, because 2111665215055 - 2⁷ = 2111665214927 is a prime.

It is a super-4 number, since 4×2111665215055⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111665214999 and 2111665215017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111665215059) 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, 19196956446 + ... + 19196956555.

It is an arithmetic number, because the mean of its divisors is an integer number (345545217018).

Almost surely, 2^{2111665215055} is an apocalyptic number.

2111665215055 is a deficient number, since it is larger than the sum of its proper divisors (652696521089).

2111665215055 is a wasteful number, since it uses less digits than its factorization.

2111665215055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38393913017.

The product of its (nonzero) digits is 90000, while the sum is 40.

The spelling of 2111665215055 in words is "two trillion, one hundred eleven billion, six hundred sixty-five million, two hundred fifteen thousand, fifty-five".