681358065584 has 40 divisors (see below), whose sum is σ = 1508985561600. Its totient is φ = 291959477568.

The previous prime is 681358065581. The next prime is 681358065607. The reversal of 681358065584 is 485560853186.

It is a happy number.

It is a super-2 number, since 2×681358065584² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681358065581) 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, 113567 + ... + 1172865.

It is an arithmetic number, because the mean of its divisors is an integer number (37724639040).

Almost surely, 2^681358065584 is an apocalyptic number.

It is an amenable number.

681358065584 is an abundant number, since it is smaller than the sum of its proper divisors (827627496016).

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

681358065584 is a wasteful number, since it uses less digits than its factorization.

681358065584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065057 (or 1065051 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 59.

The spelling of 681358065584 in words is "six hundred eighty-one billion, three hundred fifty-eight million, sixty-five thousand, five hundred eighty-four".