491616815998 has 16 divisors (see below), whose sum is σ = 919387292544. Its totient is φ = 191539019160.

The previous prime is 491616815981. The next prime is 491616816011. The reversal of 491616815998 is 899518616194.

It is a happy number.

It is a super-2 number, since 2×491616815998² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1596158340 + ... + 1596158647.

It is an arithmetic number, because the mean of its divisors is an integer number (57461705784).

Almost surely, 2^491616815998 is an apocalyptic number.

491616815998 is a deficient number, since it is larger than the sum of its proper divisors (427770476546).

491616815998 is a wasteful number, since it uses less digits than its factorization.

491616815998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3192317007.

The product of its digits is 33592320, while the sum is 67.

The spelling of 491616815998 in words is "four hundred ninety-one billion, six hundred sixteen million, eight hundred fifteen thousand, nine hundred ninety-eight".