491069169820 has 48 divisors (see below), whose sum is σ = 1085954032800. Its totient is φ = 186015191040.

The previous prime is 491069169809. The next prime is 491069169887. The reversal of 491069169820 is 28961960194.

It is a super-2 number, since 2×491069169820² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 701676 + ... + 1214284.

It is an arithmetic number, because the mean of its divisors is an integer number (22624042350).

Almost surely, 2^491069169820 is an apocalyptic number.

It is an amenable number.

491069169820 is an abundant number, since it is smaller than the sum of its proper divisors (594884862980).

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

491069169820 is a wasteful number, since it uses less digits than its factorization.

491069169820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515158 (or 515156 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 491069169820 in words is "four hundred ninety-one billion, sixty-nine million, one hundred sixty-nine thousand, eight hundred twenty".