680333681 has 4 divisors (see below), whose sum is σ = 681345252. Its totient is φ = 679322112.

The previous prime is 680333669. The next prime is 680333699. The reversal of 680333681 is 186333086.

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

It can be written as a sum of positive squares in 2 ways, for example, as 212693056 + 467640625 = 14584^2 + 21625^2 .

It is a cyclic number.

It is not a de Polignac number, because 680333681 - 2⁶ = 680333617 is a prime.

It is a super-2 number, since 2×680333681² = 925707835006019522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680333651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504776 + ... + 506121.

It is an arithmetic number, because the mean of its divisors is an integer number (170336313).

Almost surely, 2^680333681 is an apocalyptic number.

It is an amenable number.

680333681 is a deficient number, since it is larger than the sum of its proper divisors (1011571).

680333681 is a wasteful number, since it uses less digits than its factorization.

680333681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011570.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 680333681 is about 26083.2068772227. The cubic root of 680333681 is about 879.5097480207.

The spelling of 680333681 in words is "six hundred eighty million, three hundred thirty-three thousand, six hundred eighty-one".