1644167696643 has 12 divisors (see below), whose sum is σ = 2376065721120. Its totient is φ = 1095577878096.

The previous prime is 1644167696597. The next prime is 1644167696669. The reversal of 1644167696643 is 3466967614461.

1644167696643 is a `hidden beast` number, since 1 + 6 + 4 + 416 + 76 + 96 + 64 + 3 = 666.

It is not a de Polignac number, because 1644167696643 - 2⁹ = 1644167696131 is a prime.

It is a super-3 number, since 3×1644167696643³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644167656643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44473803 + ... + 44510756.

It is an arithmetic number, because the mean of its divisors is an integer number (198005476760).

Almost surely, 2^{1644167696643} is an apocalyptic number.

1644167696643 is a deficient number, since it is larger than the sum of its proper divisors (731898024477).

1644167696643 is a wasteful number, since it uses less digits than its factorization.

1644167696643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88986618 (or 88986615 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 63.

The spelling of 1644167696643 in words is "one trillion, six hundred forty-four billion, one hundred sixty-seven million, six hundred ninety-six thousand, six hundred forty-three".