1646561532043 has 4 divisors (see below), whose sum is σ = 1674469354680. Its totient is φ = 1618653709408.

The previous prime is 1646561532029. The next prime is 1646561532071. The reversal of 1646561532043 is 3402351656461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1646561532043 - 2²⁹ = 1646024661131 is a prime.

It is a super-4 number, since 4×1646561532043⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1646561531984 and 1646561532002.

It is not an unprimeable number, because it can be changed into a prime (1646561502043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13953911230 + ... + 13953911347.

It is an arithmetic number, because the mean of its divisors is an integer number (418617338670).

Almost surely, 2^{1646561532043} is an apocalyptic number.

1646561532043 is a deficient number, since it is larger than the sum of its proper divisors (27907822637).

1646561532043 is an equidigital number, since it uses as much as digits as its factorization.

1646561532043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27907822636.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 1646561532043 in words is "one trillion, six hundred forty-six billion, five hundred sixty-one million, five hundred thirty-two thousand, forty-three".