320856183905 has 8 divisors (see below), whose sum is σ = 385038326952. Its totient is φ = 256677676288.

The previous prime is 320856183883. The next prime is 320856183913. The reversal of 320856183905 is 509381658023.

It can be written as a sum of positive squares in 4 ways, for example, as 2006233681 + 318849950224 = 44791^2 + 564668^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 320856183905 - 2⁶ = 320856183841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710762 + ... + 1070931.

It is an arithmetic number, because the mean of its divisors is an integer number (48129790869).

Almost surely, 2^320856183905 is an apocalyptic number.

It is an amenable number.

320856183905 is a deficient number, since it is larger than the sum of its proper divisors (64182143047).

320856183905 is a wasteful number, since it uses less digits than its factorization.

320856183905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817715.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 320856183905 in words is "three hundred twenty billion, eight hundred fifty-six million, one hundred eighty-three thousand, nine hundred five".