491316077718 has 12 divisors (see below), whose sum is σ = 1064518168428. Its totient is φ = 163772025900.

The previous prime is 491316077657. The next prime is 491316077719. The reversal of 491316077718 is 817770613194.

It is a happy number.

491316077718 is a `hidden beast` number, since 4 + 9 + 13 + 1 + 607 + 7 + 7 + 18 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491316077719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13647668808 + ... + 13647668843.

It is an arithmetic number, because the mean of its divisors is an integer number (88709847369).

Almost surely, 2^491316077718 is an apocalyptic number.

491316077718 is an abundant number, since it is smaller than the sum of its proper divisors (573202090710).

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

491316077718 is a wasteful number, since it uses less digits than its factorization.

491316077718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27295337659 (or 27295337656 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 54.

The spelling of 491316077718 in words is "four hundred ninety-one billion, three hundred sixteen million, seventy-seven thousand, seven hundred eighteen".