385939209645 has 54 divisors (see below), whose sum is σ = 735391914894. Its totient is φ = 187099814880.

The previous prime is 385939209631. The next prime is 385939209779. The reversal of 385939209645 is 546902939583.

385939209645 is a `hidden beast` number, since 38 + 593 + 9 + 2 + 0 + 9 + 6 + 4 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 308751367716 + 77187841929 = 555654^2 + 277827^2 .

It is not a de Polignac number, because 385939209645 - 2⁶ = 385939209581 is a prime.

It is a super-3 number, since 3×385939209645³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 45837246 + ... + 45845664.

Almost surely, 2^385939209645 is an apocalyptic number.

It is an amenable number.

385939209645 is a deficient number, since it is larger than the sum of its proper divisors (349452705249).

385939209645 is an frugal number, since it uses more digits than its factorization.

385939209645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16871 (or 8438 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 63.

The spelling of 385939209645 in words is "three hundred eighty-five billion, nine hundred thirty-nine million, two hundred nine thousand, six hundred forty-five".