1644254423729 has 8 divisors (see below), whose sum is σ = 1653106640640. Its totient is φ = 1635415411536.

The previous prime is 1644254423681. The next prime is 1644254423771. The reversal of 1644254423729 is 9273244524461.

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 1644254423729 - 2²⁸ = 1643985988273 is a prime.

It is a super-3 number, since 3×1644254423729³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1644254423129) 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, 3051419 + ... + 3549600.

It is an arithmetic number, because the mean of its divisors is an integer number (206638330080).

Almost surely, 2^{1644254423729} is an apocalyptic number.

It is an amenable number.

1644254423729 is a deficient number, since it is larger than the sum of its proper divisors (8852216911).

1644254423729 is a wasteful number, since it uses less digits than its factorization.

1644254423729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6602359.

The product of its digits is 11612160, while the sum is 53.

The spelling of 1644254423729 in words is "one trillion, six hundred forty-four billion, two hundred fifty-four million, four hundred twenty-three thousand, seven hundred twenty-nine".