1646561330663 has 16 divisors (see below), whose sum is σ = 1667576820000. Its totient is φ = 1625631897600.

The previous prime is 1646561330599. The next prime is 1646561330677. The reversal of 1646561330663 is 3660331656461.

It is a cyclic number.

It is not a de Polignac number, because 1646561330663 - 2⁶ = 1646561330599 is a prime.

It is a super-2 number, since 2×1646561330663² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646561330693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101324963 + ... + 101341211.

It is an arithmetic number, because the mean of its divisors is an integer number (104223551250).

Almost surely, 2^{1646561330663} is an apocalyptic number.

1646561330663 is a deficient number, since it is larger than the sum of its proper divisors (21015489337).

1646561330663 is a wasteful number, since it uses less digits than its factorization.

1646561330663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18818.

The product of its (nonzero) digits is 4199040, while the sum is 50.

The spelling of 1646561330663 in words is "one trillion, six hundred forty-six billion, five hundred sixty-one million, three hundred thirty thousand, six hundred sixty-three".