1643231650051 has 4 divisors (see below), whose sum is σ = 1678194025632. Its totient is φ = 1608269274472.

The previous prime is 1643231650033. The next prime is 1643231650111. The reversal of 1643231650051 is 1500561323461.

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 1643231650051 - 2²⁷ = 1643097432323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643231650001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17481187720 + ... + 17481187813.

It is an arithmetic number, because the mean of its divisors is an integer number (419548506408).

Almost surely, 2^{1643231650051} is an apocalyptic number.

1643231650051 is a deficient number, since it is larger than the sum of its proper divisors (34962375581).

1643231650051 is an equidigital number, since it uses as much as digits as its factorization.

1643231650051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34962375580.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 1643231650051 in words is "one trillion, six hundred forty-three billion, two hundred thirty-one million, six hundred fifty thousand, fifty-one".