6640865692 has 6 divisors (see below), whose sum is σ = 11621514968. Its totient is φ = 3320432844.

The previous prime is 6640865629. The next prime is 6640865713. The reversal of 6640865692 is 2965680466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830108208 + ... + 830108215.

Almost surely, 2^6640865692 is an apocalyptic number.

It is an amenable number.

6640865692 is a deficient number, since it is larger than the sum of its proper divisors (4980649276).

6640865692 is a wasteful number, since it uses less digits than its factorization.

6640865692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660216427 (or 1660216425 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 52.

The square root of 6640865692 is about 81491.5068703482. The cubic root of 6640865692 is about 1879.6409541433.

The spelling of 6640865692 in words is "six billion, six hundred forty million, eight hundred sixty-five thousand, six hundred ninety-two".