681097041917 has 2 divisors, whose sum is σ = 681097041918. Its totient is φ = 681097041916.

The previous prime is 681097041847. The next prime is 681097041949. The reversal of 681097041917 is 719140790186.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 508784050681 + 172312991236 = 713291^2 + 415106^2 .

It is a cyclic number.

It is not a de Polignac number, because 681097041917 - 2¹² = 681097037821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681097041997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340548520958 + 340548520959.

It is an arithmetic number, because the mean of its divisors is an integer number (340548520959).

Almost surely, 2^681097041917 is an apocalyptic number.

It is an amenable number.

681097041917 is a deficient number, since it is larger than the sum of its proper divisors (1).

681097041917 is an equidigital number, since it uses as much as digits as its factorization.

681097041917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 53.

The spelling of 681097041917 in words is "six hundred eighty-one billion, ninety-seven million, forty-one thousand, nine hundred seventeen".