1640065563 has 14 divisors (see below), whose sum is σ = 2458974564. Its totient is φ = 1093376556.

The previous prime is 1640065529. The next prime is 1640065591. The reversal of 1640065563 is 3655600461.

1640065563 is a `hidden beast` number, since 1 + 640 + 0 + 6 + 5 + 5 + 6 + 3 = 666.

It is not a de Polignac number, because 1640065563 - 2¹⁰ = 1640064539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640065513) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1124145 + ... + 1125602.

Almost surely, 2^1640065563 is an apocalyptic number.

1640065563 is a deficient number, since it is larger than the sum of its proper divisors (818909001).

1640065563 is an frugal number, since it uses more digits than its factorization.

1640065563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249765 (or 2249750 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 1640065563 is about 40497.7229359874. The cubic root of 1640065563 is about 1179.2894225656.

The spelling of 1640065563 in words is "one billion, six hundred forty million, sixty-five thousand, five hundred sixty-three".