491684445678 has 16 divisors (see below), whose sum is σ = 986048375040. Its totient is φ = 163448234616.

The previous prime is 491684445677. The next prime is 491684445709. The reversal of 491684445678 is 876544486194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491684445677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111642768 + ... + 111647171.

It is an arithmetic number, because the mean of its divisors is an integer number (61628023440).

Almost surely, 2^491684445678 is an apocalyptic number.

491684445678 is an abundant number, since it is smaller than the sum of its proper divisors (494363929362).

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

491684445678 is a wasteful number, since it uses less digits than its factorization.

491684445678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223290311.

The product of its digits is 185794560, while the sum is 66.

The spelling of 491684445678 in words is "four hundred ninety-one billion, six hundred eighty-four million, four hundred forty-five thousand, six hundred seventy-eight".