680811078402 has 320 divisors, whose sum is σ = 1896846336000. Its totient is φ = 177721568640.

The previous prime is 680811078391. The next prime is 680811078427. The reversal of 680811078402 is 204870118086.

680811078402 is a `hidden beast` number, since 68 + 0 + 8 + 110 + 78 + 402 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 701143777 + ... + 701144747.

It is an arithmetic number, because the mean of its divisors is an integer number (5927644800).

Almost surely, 2^680811078402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 680811078402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (948423168000).

680811078402 is an abundant number, since it is smaller than the sum of its proper divisors (1216035257598).

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

680811078402 is a wasteful number, since it uses less digits than its factorization.

680811078402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443 (or 1434 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The spelling of 680811078402 in words is "six hundred eighty billion, eight hundred eleven million, seventy-eight thousand, four hundred two".