1645449673383 has 48 divisors (see below), whose sum is σ = 2472992121600. Its totient is φ = 1053417720960.

The previous prime is 1645449673363. The next prime is 1645449673433. The reversal of 1645449673383 is 3833769445461.

It is a happy number.

1645449673383 is a `hidden beast` number, since 1 + 6 + 4 + 544 + 9 + 6 + 7 + 3 + 3 + 83 = 666.

It is not a de Polignac number, because 1645449673383 - 2¹³ = 1645449665191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645449673383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645449673333) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32584408 + ... + 32634866.

It is an arithmetic number, because the mean of its divisors is an integer number (51520669200).

Almost surely, 2^{1645449673383} is an apocalyptic number.

1645449673383 is a deficient number, since it is larger than the sum of its proper divisors (827542448217).

1645449673383 is a wasteful number, since it uses less digits than its factorization.

1645449673383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51892 (or 51889 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 63.

The spelling of 1645449673383 in words is "one trillion, six hundred forty-five billion, four hundred forty-nine million, six hundred seventy-three thousand, three hundred eighty-three".