681402400636 has 36 divisors (see below), whose sum is σ = 1313236390032. Its totient is φ = 308736084096.

The previous prime is 681402400559. The next prime is 681402400643. The reversal of 681402400636 is 636004204186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10225165 + ... + 10291588.

It is an arithmetic number, because the mean of its divisors is an integer number (36478788612).

Almost surely, 2^681402400636 is an apocalyptic number.

It is an amenable number.

681402400636 is a deficient number, since it is larger than the sum of its proper divisors (631833989396).

681402400636 is a wasteful number, since it uses less digits than its factorization.

681402400636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20516818 (or 20516797 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 681402400636 in words is "six hundred eighty-one billion, four hundred two million, four hundred thousand, six hundred thirty-six".