618820557444697 has 2 divisors, whose sum is σ = 618820557444698. Its totient is φ = 618820557444696.

The previous prime is 618820557444653. The next prime is 618820557444707. The reversal of 618820557444697 is 796444755028816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581337620571136 + 37482936873561 = 24110944^2 + 6122331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618820557444697 is a prime.

It is not a weakly prime, because it can be changed into another prime (618820557442697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309410278722348 + 309410278722349.

It is an arithmetic number, because the mean of its divisors is an integer number (309410278722349).

Almost surely, 2^{618820557444697} is an apocalyptic number.

It is an amenable number.

618820557444697 is a deficient number, since it is larger than the sum of its proper divisors (1).

618820557444697 is an equidigital number, since it uses as much as digits as its factorization.

618820557444697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3251404800, while the sum is 76.

The spelling of 618820557444697 in words is "six hundred eighteen trillion, eight hundred twenty billion, five hundred fifty-seven million, four hundred forty-four thousand, six hundred ninety-seven".