680320743491 has 4 divisors (see below), whose sum is σ = 685286588472. Its totient is φ = 675354898512.

The previous prime is 680320743379. The next prime is 680320743497. The reversal of 680320743491 is 194347023086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194347023086 = 2 ⋅97173511543.

It is a cyclic number.

It is not a de Polignac number, because 680320743491 - 2³⁴ = 663140874307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680320743497) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2482922285 + ... + 2482922558.

It is an arithmetic number, because the mean of its divisors is an integer number (171321647118).

Almost surely, 2^680320743491 is an apocalyptic number.

680320743491 is a deficient number, since it is larger than the sum of its proper divisors (4965844981).

680320743491 is a wasteful number, since it uses less digits than its factorization.

680320743491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965844980.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 680320743491 in words is "six hundred eighty billion, three hundred twenty million, seven hundred forty-three thousand, four hundred ninety-one".