1644067545 has 8 divisors (see below), whose sum is σ = 2630508096. Its totient is φ = 876836016.

The previous prime is 1644067543. The next prime is 1644067559. The reversal of 1644067545 is 5457604461.

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

It is not a de Polignac number, because 1644067545 - 2¹ = 1644067543 is a prime.

It is a super-3 number, since 3×1644067545³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1644067497 and 1644067506.

It is not an unprimeable number, because it can be changed into a prime (1644067543) 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, 54802237 + ... + 54802266.

It is an arithmetic number, because the mean of its divisors is an integer number (328813512).

Almost surely, 2^1644067545 is an apocalyptic number.

1644067545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1644067545 is a deficient number, since it is larger than the sum of its proper divisors (986440551).

1644067545 is a wasteful number, since it uses less digits than its factorization.

1644067545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109604511.

The product of its (nonzero) digits is 403200, while the sum is 42.

The square root of 1644067545 is about 40547.1027941578. The cubic root of 1644067545 is about 1180.2478520349.

The spelling of 1644067545 in words is "one billion, six hundred forty-four million, sixty-seven thousand, five hundred forty-five".