491566889242 has 48 divisors (see below), whose sum is σ = 871213879872. Its totient is φ = 206205317760.

The previous prime is 491566889213. The next prime is 491566889249. The reversal of 491566889242 is 242988665194.

It is not an unprimeable number, because it can be changed into a prime (491566889249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20128203 + ... + 20152609.

It is an arithmetic number, because the mean of its divisors is an integer number (18150289164).

Almost surely, 2^491566889242 is an apocalyptic number.

491566889242 is a deficient number, since it is larger than the sum of its proper divisors (379646990630).

491566889242 is a wasteful number, since it uses less digits than its factorization.

491566889242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29863 (or 29850 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 64.

The spelling of 491566889242 in words is "four hundred ninety-one billion, five hundred sixty-six million, eight hundred eighty-nine thousand, two hundred forty-two".