1640065564 has 24 divisors (see below), whose sum is σ = 2943839808. Its totient is φ = 799119360.

The previous prime is 1640065529. The next prime is 1640065591. The reversal of 1640065564 is 4655600461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25084 + ... + 62524.

It is an arithmetic number, because the mean of its divisors is an integer number (122659992).

Almost surely, 2^1640065564 is an apocalyptic number.

It is an amenable number.

1640065564 is a deficient number, since it is larger than the sum of its proper divisors (1303774244).

1640065564 is a wasteful number, since it uses less digits than its factorization.

1640065564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37725 (or 37723 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 1640065564 is about 40497.7229483338. The cubic root of 1640065564 is about 1179.2894228053.

The spelling of 1640065564 in words is "one billion, six hundred forty million, sixty-five thousand, five hundred sixty-four".