856512689445 has 144 divisors (see below), whose sum is σ = 1783751703552. Its totient is φ = 378698664960.

The previous prime is 856512689423. The next prime is 856512689447. The reversal of 856512689445 is 544986215658.

856512689445 is a `hidden beast` number, since 8 + 5 + 65 + 126 + 8 + 9 + 445 = 666.

It is not a de Polignac number, because 856512689445 - 2⁵ = 856512689413 is a prime.

It is a super-2 number, since 2×856512689445² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856512689447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 193647504 + ... + 193651926.

It is an arithmetic number, because the mean of its divisors is an integer number (12387164608).

Almost surely, 2^856512689445 is an apocalyptic number.

It is an amenable number.

856512689445 is an abundant number, since it is smaller than the sum of its proper divisors (927239014107).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856512689445 is a wasteful number, since it uses less digits than its factorization.

856512689445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7312 (or 7302 counting only the distinct ones).

The product of its digits is 82944000, while the sum is 63.

The spelling of 856512689445 in words is "eight hundred fifty-six billion, five hundred twelve million, six hundred eighty-nine thousand, four hundred forty-five".