491066651812 has 24 divisors (see below), whose sum is σ = 992637404640. Its totient is φ = 210081989760.

The previous prime is 491066651773. The next prime is 491066651813. The reversal of 491066651812 is 218156660194.

It is a happy number.

It is a super-2 number, since 2×491066651812² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491066651813) 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, 328252362 + ... + 328253857.

It is an arithmetic number, because the mean of its divisors is an integer number (41359891860).

Almost surely, 2^491066651812 is an apocalyptic number.

It is an amenable number.

491066651812 is an abundant number, since it is smaller than the sum of its proper divisors (501570752828).

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

491066651812 is a wasteful number, since it uses less digits than its factorization.

491066651812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656506251 (or 656506249 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 491066651812 in words is "four hundred ninety-one billion, sixty-six million, six hundred fifty-one thousand, eight hundred twelve".