645885760185 has 48 divisors (see below), whose sum is σ = 1160258523840. Its totient is φ = 331985646720.

The previous prime is 645885760111. The next prime is 645885760229. The reversal of 645885760185 is 581067588546.

645885760185 is a `hidden beast` number, since 6 + 4 + 58 + 8 + 576 + 0 + 1 + 8 + 5 = 666.

It is not a de Polignac number, because 645885760185 - 2³⁴ = 628705891001 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 261430 + ... + 1166240.

It is an arithmetic number, because the mean of its divisors is an integer number (24172052580).

Almost surely, 2^645885760185 is an apocalyptic number.

It is an amenable number.

645885760185 is a deficient number, since it is larger than the sum of its proper divisors (514372763655).

645885760185 is a wasteful number, since it uses less digits than its factorization.

645885760185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905398 (or 905395 counting only the distinct ones).

The product of its (nonzero) digits is 64512000, while the sum is 63.

The spelling of 645885760185 in words is "six hundred forty-five billion, eight hundred eighty-five million, seven hundred sixty thousand, one hundred eighty-five".