6918021797 has 2 divisors, whose sum is σ = 6918021798. Its totient is φ = 6918021796.

The previous prime is 6918021793. The next prime is 6918021821. The reversal of 6918021797 is 7971208196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3853181476 + 3064840321 = 62074^2 + 55361^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918021797 - 2² = 6918021793 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6918021793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459010898 + 3459010899.

It is an arithmetic number, because the mean of its divisors is an integer number (3459010899).

Almost surely, 2^6918021797 is an apocalyptic number.

It is an amenable number.

6918021797 is a deficient number, since it is larger than the sum of its proper divisors (1).

6918021797 is an equidigital number, since it uses as much as digits as its factorization.

6918021797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 50.

The square root of 6918021797 is about 83174.6463593324. The cubic root of 6918021797 is about 1905.4342850627.

The spelling of 6918021797 in words is "six billion, nine hundred eighteen million, twenty-one thousand, seven hundred ninety-seven".