491173210418 has 16 divisors (see below), whose sum is σ = 809060754240. Its totient is φ = 221782002000.

The previous prime is 491173210417. The next prime is 491173210499. The reversal of 491173210418 is 814012371194.

It is a super-2 number, since 2×491173210418² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491173210417) 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, 73924013 + ... + 73930656.

It is an arithmetic number, because the mean of its divisors is an integer number (50566297140).

Almost surely, 2^491173210418 is an apocalyptic number.

491173210418 is a deficient number, since it is larger than the sum of its proper divisors (317887543822).

491173210418 is a wasteful number, since it uses less digits than its factorization.

491173210418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147854833.

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 491173210418 in words is "four hundred ninety-one billion, one hundred seventy-three million, two hundred ten thousand, four hundred eighteen".