671340784686 has 64 divisors (see below), whose sum is σ = 1580578272000. Its totient is φ = 187411184640.

The previous prime is 671340784679. The next prime is 671340784691. The reversal of 671340784686 is 686487043176.

It is a happy number.

671340784686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 355875 + ... + 1212158.

It is an arithmetic number, because the mean of its divisors is an integer number (24696535500).

Almost surely, 2^671340784686 is an apocalyptic number.

671340784686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

671340784686 is an abundant number, since it is smaller than the sum of its proper divisors (909237487314).

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

671340784686 is a wasteful number, since it uses less digits than its factorization.

671340784686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568561.

The product of its (nonzero) digits is 32514048, while the sum is 60.

The spelling of 671340784686 in words is "six hundred seventy-one billion, three hundred forty million, seven hundred eighty-four thousand, six hundred eighty-six".