840492665808 has 20 divisors (see below), whose sum is σ = 2171272720128. Its totient is φ = 280164221920.

The previous prime is 840492665791. The next prime is 840492665813. The reversal of 840492665808 is 808566294048.

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 in 3 ways as a sum of consecutive naturals, for example, 8755131888 + ... + 8755131983.

Almost surely, 2^840492665808 is an apocalyptic number.

It is an amenable number.

840492665808 is an abundant number, since it is smaller than the sum of its proper divisors (1330780054320).

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

840492665808 is a wasteful number, since it uses less digits than its factorization.

840492665808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17510263882 (or 17510263876 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 60.

The spelling of 840492665808 in words is "eight hundred forty billion, four hundred ninety-two million, six hundred sixty-five thousand, eight hundred eight".