1646404106121 has 12 divisors (see below), whose sum is σ = 2383556443840. Its totient is φ = 1095102500760.

The previous prime is 1646404106111. The next prime is 1646404106161. The reversal of 1646404106121 is 1216014046461.

1646404106121 is a `hidden beast` number, since 1 + 6 + 4 + 640 + 4 + 1 + 0 + 6 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 1646404106121 - 2⁹ = 1646404105609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1646404106111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208348885 + ... + 208356786.

Almost surely, 2^{1646404106121} is an apocalyptic number.

It is an amenable number.

1646404106121 is a deficient number, since it is larger than the sum of its proper divisors (737152337719).

1646404106121 is a wasteful number, since it uses less digits than its factorization.

1646404106121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416706116 (or 416706113 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 1646404106121 in words is "one trillion, six hundred forty-six billion, four hundred four million, one hundred six thousand, one hundred twenty-one".