681909070909147 has 2 divisors, whose sum is σ = 681909070909148. Its totient is φ = 681909070909146.

The previous prime is 681909070909117. The next prime is 681909070909181. The reversal of 681909070909147 is 741909070909186.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681909070909147 is a prime.

It is not a weakly prime, because it can be changed into another prime (681909070909117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340954535454573 + 340954535454574.

It is an arithmetic number, because the mean of its divisors is an integer number (340954535454574).

Almost surely, 2^{681909070909147} is an apocalyptic number.

681909070909147 is a deficient number, since it is larger than the sum of its proper divisors (1).

681909070909147 is an equidigital number, since it uses as much as digits as its factorization.

681909070909147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61725888, while the sum is 70.

The spelling of 681909070909147 in words is "six hundred eighty-one trillion, nine hundred nine billion, seventy million, nine hundred nine thousand, one hundred forty-seven".