664578671384 has 8 divisors (see below), whose sum is σ = 1246085008860. Its totient is φ = 332289335688.

The previous prime is 664578671363. The next prime is 664578671413. The reversal of 664578671384 is 483176875466.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 664578671384.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41536166954 + ... + 41536166969.

Almost surely, 2^664578671384 is an apocalyptic number.

It is an amenable number.

664578671384 is a deficient number, since it is larger than the sum of its proper divisors (581506337476).

664578671384 is a wasteful number, since it uses less digits than its factorization.

664578671384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83072333929 (or 83072333925 counting only the distinct ones).

The product of its digits is 162570240, while the sum is 65.

The spelling of 664578671384 in words is "six hundred sixty-four billion, five hundred seventy-eight million, six hundred seventy-one thousand, three hundred eighty-four".