491148735644 has 24 divisors (see below), whose sum is σ = 990990375648. Its totient is φ = 208629550080.

The previous prime is 491148735643. The next prime is 491148735667. The reversal of 491148735644 is 446537841194.

It is a self number, because there is not a number n which added to its sum of digits gives 491148735644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491148735641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77611997 + ... + 77618324.

It is an arithmetic number, because the mean of its divisors is an integer number (41291265652).

Almost surely, 2^491148735644 is an apocalyptic number.

It is an amenable number.

491148735644 is an abundant number, since it is smaller than the sum of its proper divisors (499841640004).

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

491148735644 is a wasteful number, since it uses less digits than its factorization.

491148735644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155230445 (or 155230443 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 56.

The spelling of 491148735644 in words is "four hundred ninety-one billion, one hundred forty-eight million, seven hundred thirty-five thousand, six hundred forty-four".