491572716644 has 6 divisors (see below), whose sum is σ = 860252254134. Its totient is φ = 245786358320.

The previous prime is 491572716643. The next prime is 491572716647. The reversal of 491572716644 is 446617275194.

It can be written as a sum of positive squares in only one way, i.e., 421411302244 + 70161414400 = 649162^2 + 264880^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 491572716644.

It is not an unprimeable number, because it can be changed into a prime (491572716643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61446589577 + ... + 61446589584.

It is an arithmetic number, because the mean of its divisors is an integer number (143375375689).

Almost surely, 2^491572716644 is an apocalyptic number.

It is an amenable number.

491572716644 is a deficient number, since it is larger than the sum of its proper divisors (368679537490).

491572716644 is a wasteful number, since it uses less digits than its factorization.

491572716644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122893179165 (or 122893179163 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 56.

The spelling of 491572716644 in words is "four hundred ninety-one billion, five hundred seventy-two million, seven hundred sixteen thousand, six hundred forty-four".