681346680149 has 2 divisors, whose sum is σ = 681346680150. Its totient is φ = 681346680148.

The previous prime is 681346680121. The next prime is 681346680221. The reversal of 681346680149 is 941086643186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602087539249 + 79259140900 = 775943^2 + 281530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681346680149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681346680094 and 681346680103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681346680349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340673340074 + 340673340075.

It is an arithmetic number, because the mean of its divisors is an integer number (340673340075).

Almost surely, 2^681346680149 is an apocalyptic number.

It is an amenable number.

681346680149 is a deficient number, since it is larger than the sum of its proper divisors (1).

681346680149 is an equidigital number, since it uses as much as digits as its factorization.

681346680149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 56.

The spelling of 681346680149 in words is "six hundred eighty-one billion, three hundred forty-six million, six hundred eighty thousand, one hundred forty-nine".