491764196450 has 18 divisors (see below), whose sum is σ = 914690628579. Its totient is φ = 196703695120.

The previous prime is 491764196447. The next prime is 491764196477. The reversal of 491764196450 is 54691467194.

It can be written as a sum of positive squares in 5 ways, for example, as 18749003329 + 473015193121 = 136927^2 + 687761^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=495865.

It is a super-2 number, since 2×491764196450² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4909064 + ... + 5008236.

Almost surely, 2^491764196450 is an apocalyptic number.

491764196450 is a deficient number, since it is larger than the sum of its proper divisors (422926432129).

491764196450 is an frugal number, since it uses more digits than its factorization.

491764196450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198358 (or 99180 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 491764196450 in words is "four hundred ninety-one billion, seven hundred sixty-four million, one hundred ninety-six thousand, four hundred fifty".