857876078656 has 21 divisors (see below), whose sum is σ = 1702362547389. Its totient is φ = 428934334464.

The previous prime is 857876078639. The next prime is 857876078687. The reversal of 857876078656 is 656870678758.

The square root of 857876078656 is 926216.

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

It can be written as a sum of positive squares in only one way, i.e., 85614760000 + 772261318656 = 292600^2 + 878784^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7351840 + ... + 7467616.

It is an arithmetic number, because the mean of its divisors is an integer number (81064883209).

Almost surely, 2^857876078656 is an apocalyptic number.

857876078656 is the 926216-th square number.

It is an amenable number.

857876078656 is a deficient number, since it is larger than the sum of its proper divisors (844486468733).

857876078656 is an frugal number, since it uses more digits than its factorization.

857876078656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231566 (or 115779 counting only the distinct ones).

The product of its (nonzero) digits is 948326400, while the sum is 73.

The spelling of 857876078656 in words is "eight hundred fifty-seven billion, eight hundred seventy-six million, seventy-eight thousand, six hundred fifty-six".