681722218012 has 24 divisors (see below), whose sum is σ = 1301824524672. Its totient is φ = 309789250800.

The previous prime is 681722217971. The next prime is 681722218057. The reversal of 681722218012 is 210812227186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1948758 + ... + 2271805.

It is an arithmetic number, because the mean of its divisors is an integer number (54242688528).

Almost surely, 2^681722218012 is an apocalyptic number.

It is an amenable number.

681722218012 is a deficient number, since it is larger than the sum of its proper divisors (620102306660).

681722218012 is a wasteful number, since it uses less digits than its factorization.

681722218012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224249 (or 4224247 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The spelling of 681722218012 in words is "six hundred eighty-one billion, seven hundred twenty-two million, two hundred eighteen thousand, twelve".