6646535221201 has 16 divisors (see below), whose sum is σ = 6768093765888. Its totient is φ = 6526270080000.

The previous prime is 6646535221189. The next prime is 6646535221211. The reversal of 6646535221201 is 1021225356466.

It is a cyclic number.

It is not a de Polignac number, because 6646535221201 - 2¹³ = 6646535213009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6646535221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6415801 + ... + 7379401.

It is an arithmetic number, because the mean of its divisors is an integer number (423005860368).

Almost surely, 2^{6646535221201} is an apocalyptic number.

It is an amenable number.

6646535221201 is a deficient number, since it is larger than the sum of its proper divisors (121558544687).

6646535221201 is a wasteful number, since it uses less digits than its factorization.

6646535221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964272.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 6646535221201 in words is "six trillion, six hundred forty-six billion, five hundred thirty-five million, two hundred twenty-one thousand, two hundred one".