491805356782 has 4 divisors (see below), whose sum is σ = 737708035176. Its totient is φ = 245902678390.

The previous prime is 491805356743. The next prime is 491805356813. The reversal of 491805356782 is 287653508194.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122951339194 + ... + 122951339197.

It is an arithmetic number, because the mean of its divisors is an integer number (184427008794).

It is a 1-persistent number, because it is pandigital, but 2⋅491805356782 = 983610713564 is not.

Almost surely, 2^491805356782 is an apocalyptic number.

491805356782 is a deficient number, since it is larger than the sum of its proper divisors (245902678394).

491805356782 is a wasteful number, since it uses less digits than its factorization.

491805356782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245902678393.

The product of its (nonzero) digits is 14515200, while the sum is 58.

The spelling of 491805356782 in words is "four hundred ninety-one billion, eight hundred five million, three hundred fifty-six thousand, seven hundred eighty-two".