856309457122 has 16 divisors (see below), whose sum is σ = 1489868907840. Its totient is φ = 361512307728.

The previous prime is 856309457111. The next prime is 856309457123. The reversal of 856309457122 is 221754903658.

It is a self number, because there is not a number n which added to its sum of digits gives 856309457122.

It is not an unprimeable number, because it can be changed into a prime (856309457123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456453997 + ... + 456455872.

It is an arithmetic number, because the mean of its divisors is an integer number (93116806740).

It is a 1-persistent number, because it is pandigital, but 2⋅856309457122 = 1712618914244 is not.

Almost surely, 2^856309457122 is an apocalyptic number.

856309457122 is a deficient number, since it is larger than the sum of its proper divisors (633559450718).

856309457122 is a wasteful number, since it uses less digits than its factorization.

856309457122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912909945.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 856309457122 in words is "eight hundred fifty-six billion, three hundred nine million, four hundred fifty-seven thousand, one hundred twenty-two".