1640504995684 has 9 divisors (see below), whose sum is σ = 2870888225331. Its totient is φ = 820251217020.

The previous prime is 1640504995673. The next prime is 1640504995693. The reversal of 1640504995684 is 4865994050461.

It is a happy number.

The square root of 1640504995684 is 1280822.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2241439 + ... + 2881849.

Almost surely, 2^{1640504995684} is an apocalyptic number.

1640504995684 is the 1280822-nd square number.

It is an amenable number.

1640504995684 is a deficient number, since it is larger than the sum of its proper divisors (1230383229647).

1640504995684 is an frugal number, since it uses more digits than its factorization.

1640504995684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280826 (or 640413 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 1640504995684 in words is "one trillion, six hundred forty billion, five hundred four million, nine hundred ninety-five thousand, six hundred eighty-four".