680781377 has 2 divisors, whose sum is σ = 680781378. Its totient is φ = 680781376.

The previous prime is 680781373. The next prime is 680781383. The reversal of 680781377 is 773187086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422343601 + 258437776 = 20551^2 + 16076^2 .

It is a cyclic number.

It is not a de Polignac number, because 680781377 - 2² = 680781373 is a prime.

It is a super-2 number, since 2×680781377² = 926926566540032258, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (680781373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340390688 + 340390689.

It is an arithmetic number, because the mean of its divisors is an integer number (340390689).

Almost surely, 2^680781377 is an apocalyptic number.

It is an amenable number.

680781377 is a deficient number, since it is larger than the sum of its proper divisors (1).

680781377 is an equidigital number, since it uses as much as digits as its factorization.

680781377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 680781377 is about 26091.7875393772. The cubic root of 680781377 is about 879.7026272252.

The spelling of 680781377 in words is "six hundred eighty million, seven hundred eighty-one thousand, three hundred seventy-seven".