680545817 has 4 divisors (see below), whose sum is σ = 777766656. Its totient is φ = 583324980.

The previous prime is 680545799. The next prime is 680545837. The reversal of 680545817 is 718545086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 680545817 - 2⁶ = 680545753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680545837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48610409 + ... + 48610422.

It is an arithmetic number, because the mean of its divisors is an integer number (194441664).

Almost surely, 2^680545817 is an apocalyptic number.

It is an amenable number.

680545817 is a deficient number, since it is larger than the sum of its proper divisors (97220839).

680545817 is an equidigital number, since it uses as much as digits as its factorization.

680545817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97220838.

The product of its (nonzero) digits is 268800, while the sum is 44.

The square root of 680545817 is about 26087.2730847822. The cubic root of 680545817 is about 879.6011523303.

The spelling of 680545817 in words is "six hundred eighty million, five hundred forty-five thousand, eight hundred seventeen".