3645398007873 has 6 divisors (see below), whose sum is σ = 5265574900274. Its totient is φ = 2430265338576.

The previous prime is 3645398007859. The next prime is 3645398007877. The reversal of 3645398007873 is 3787008935463.

3645398007873 is a `hidden beast` number, since 36 + 453 + 9 + 80 + 0 + 7 + 8 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2144253562929 + 1501144444944 = 1464327^2 + 1225212^2 .

It is not a de Polignac number, because 3645398007873 - 2⁵ = 3645398007841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3645398007873.

It is not an unprimeable number, because it can be changed into a prime (3645398007877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202522111540 + ... + 202522111557.

Almost surely, 2^{3645398007873} is an apocalyptic number.

It is an amenable number.

3645398007873 is a deficient number, since it is larger than the sum of its proper divisors (1620176892401).

3645398007873 is a wasteful number, since it uses less digits than its factorization.

3645398007873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405044223103 (or 405044223100 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 63.

The spelling of 3645398007873 in words is "three trillion, six hundred forty-five billion, three hundred ninety-eight million, seven thousand, eight hundred seventy-three".