1644012705049 has 32 divisors (see below), whose sum is σ = 2027053050624. Its totient is φ = 1311980609280.

The previous prime is 1644012705043. The next prime is 1644012705119. The reversal of 1644012705049 is 9405072104461.

It is not a de Polignac number, because 1644012705049 - 2¹⁹ = 1644012180761 is a prime.

It is a super-3 number, since 3×1644012705049³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1644012704996 and 1644012705014.

It is not an unprimeable number, because it can be changed into a prime (1644012705043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 875662 + ... + 2013655.

It is an arithmetic number, because the mean of its divisors is an integer number (63345407832).

Almost surely, 2^{1644012705049} is an apocalyptic number.

It is an amenable number.

1644012705049 is a deficient number, since it is larger than the sum of its proper divisors (383040345575).

1644012705049 is a wasteful number, since it uses less digits than its factorization.

1644012705049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889537.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 1644012705049 in words is "one trillion, six hundred forty-four billion, twelve million, seven hundred five thousand, forty-nine".