856535442064 has 45 divisors (see below), whose sum is σ = 1687633876539. Its totient is φ = 421135879680.

The previous prime is 856535441977. The next prime is 856535442089. The reversal of 856535442064 is 460244535658.

The square root of 856535442064 is 925492.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 566436864400 + 290098577664 = 752620^2 + 538608^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 225818152 + ... + 225821944.

Almost surely, 2^856535442064 is an apocalyptic number.

856535442064 is the 925492-nd square number.

It is an amenable number.

856535442064 is a deficient number, since it is larger than the sum of its proper divisors (831098434475).

856535442064 is an frugal number, since it uses more digits than its factorization.

856535442064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7716 (or 3856 counting only the distinct ones).

The product of its (nonzero) digits is 13824000, while the sum is 52.

The spelling of 856535442064 in words is "eight hundred fifty-six billion, five hundred thirty-five million, four hundred forty-two thousand, sixty-four".