215666052105 has 32 divisors (see below), whose sum is σ = 395374636800. Its totient is φ = 98336731392.

The previous prime is 215666052089. The next prime is 215666052139. The reversal of 215666052105 is 501250666512.

It is a happy number.

It is not a de Polignac number, because 215666052105 - 2⁴ = 215666052089 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2599210 + ... + 2680899.

It is an arithmetic number, because the mean of its divisors is an integer number (12355457400).

Almost surely, 2^215666052105 is an apocalyptic number.

It is an amenable number.

215666052105 is a deficient number, since it is larger than the sum of its proper divisors (179708584695).

215666052105 is a wasteful number, since it uses less digits than its factorization.

215666052105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5280513.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 215666052105 in words is "two hundred fifteen billion, six hundred sixty-six million, fifty-two thousand, one hundred five".