491316077820 has 48 divisors (see below), whose sum is σ = 1376449165728. Its totient is φ = 130944844800.

The previous prime is 491316077797. The next prime is 491316077821. The reversal of 491316077820 is 28770613194.

It is a happy number.

491316077820 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 491316077820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491316077821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2165289 + ... + 2381408.

It is an arithmetic number, because the mean of its divisors is an integer number (28676024286).

Almost surely, 2^491316077820 is an apocalyptic number.

It is an amenable number.

491316077820 is an abundant number, since it is smaller than the sum of its proper divisors (885133087908).

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

491316077820 is a wasteful number, since it uses less digits than its factorization.

491316077820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548510 (or 4548508 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 491316077820 in words is "four hundred ninety-one billion, three hundred sixteen million, seventy-seven thousand, eight hundred twenty".