646211105 has 16 divisors (see below), whose sum is σ = 831043584. Its totient is φ = 481124160.

The previous prime is 646211077. The next prime is 646211107. The reversal of 646211105 is 501112646.

It is not a de Polignac number, because 646211105 - 2²⁶ = 579102241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (646211107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71681 + ... + 80190.

It is an arithmetic number, because the mean of its divisors is an integer number (51940224).

Almost surely, 2^646211105 is an apocalyptic number.

It is an amenable number.

646211105 is a deficient number, since it is larger than the sum of its proper divisors (184832479).

646211105 is a wasteful number, since it uses less digits than its factorization.

646211105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151936.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 646211105 is about 25420.6826226205. The cubic root of 646211105 is about 864.5527017912.

The spelling of 646211105 in words is "six hundred forty-six million, two hundred eleven thousand, one hundred five".