664050001640 has 16 divisors (see below), whose sum is σ = 1494112503780. Its totient is φ = 265620000640.

The previous prime is 664050001639. The next prime is 664050001663. The reversal of 664050001640 is 46100050466.

It can be written as a sum of positive squares in 2 ways, for example, as 639740826244 + 24309175396 = 799838^2 + 155914^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664050001597 and 664050001606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8300624981 + ... + 8300625060.

Almost surely, 2^664050001640 is an apocalyptic number.

It is an amenable number.

664050001640 is an abundant number, since it is smaller than the sum of its proper divisors (830062502140).

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

664050001640 is a wasteful number, since it uses less digits than its factorization.

664050001640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16601250052 (or 16601250048 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 664050001640 in words is "six hundred sixty-four billion, fifty million, one thousand, six hundred forty".