664719729318 has 16 divisors (see below), whose sum is σ = 1477154954160. Its totient is φ = 221573243088.

The previous prime is 664719729307. The next prime is 664719729361. The reversal of 664719729318 is 813927917466.

664719729318 is a `hidden beast` number, since 6 + 6 + 471 + 9 + 72 + 93 + 1 + 8 = 666.

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, 6154812255 + ... + 6154812362.

It is an arithmetic number, because the mean of its divisors is an integer number (92322184635).

Almost surely, 2^664719729318 is an apocalyptic number.

664719729318 is an abundant number, since it is smaller than the sum of its proper divisors (812435224842).

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

664719729318 is a wasteful number, since it uses less digits than its factorization.

664719729318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12309624628 (or 12309624622 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The spelling of 664719729318 in words is "six hundred sixty-four billion, seven hundred nineteen million, seven hundred twenty-nine thousand, three hundred eighteen".