1644651216341 has 16 divisors (see below), whose sum is σ = 1951821314688. Its totient is φ = 1356478099200.

The previous prime is 1644651216331. The next prime is 1644651216379. The reversal of 1644651216341 is 1436121564461.

It is not a de Polignac number, because 1644651216341 - 2²² = 1644647022037 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1644651216292 and 1644651216301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644651216331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39228995 + ... + 39270896.

It is an arithmetic number, because the mean of its divisors is an integer number (121988832168).

Almost surely, 2^{1644651216341} is an apocalyptic number.

It is an amenable number.

1644651216341 is a deficient number, since it is larger than the sum of its proper divisors (307170098347).

1644651216341 is an equidigital number, since it uses as much as digits as its factorization.

1644651216341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78500012.

The product of its digits is 414720, while the sum is 44.

The spelling of 1644651216341 in words is "one trillion, six hundred forty-four billion, six hundred fifty-one million, two hundred sixteen thousand, three hundred forty-one".