1644360242671 has 8 divisors (see below), whose sum is σ = 1647039214800. Its totient is φ = 1641683389632.

The previous prime is 1644360242653. The next prime is 1644360242699. The reversal of 1644360242671 is 1762420634461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1644360242671 - 2¹⁹ = 1644359718383 is a prime.

It is a super-3 number, since 3×1644360242671³ (a number of 38 digits) contains 333 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 (1644360242171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1027161 + ... + 2084173.

It is an arithmetic number, because the mean of its divisors is an integer number (205879901850).

Almost surely, 2^{1644360242671} is an apocalyptic number.

1644360242671 is a deficient number, since it is larger than the sum of its proper divisors (2678972129).

1644360242671 is a wasteful number, since it uses less digits than its factorization.

1644360242671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059545.

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 1644360242671 in words is "one trillion, six hundred forty-four billion, three hundred sixty million, two hundred forty-two thousand, six hundred seventy-one".