6918407998553 has 2 divisors, whose sum is σ = 6918407998554. Its totient is φ = 6918407998552.

The previous prime is 6918407998531. The next prime is 6918407998589. The reversal of 6918407998553 is 3558997048196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6766173808969 + 152234189584 = 2601187^2 + 390172^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918407998553 - 2²⁶ = 6918340889689 is a prime.

It is not a weakly prime, because it can be changed into another prime (6918407988553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459203999276 + 3459203999277.

It is an arithmetic number, because the mean of its divisors is an integer number (3459203999277).

Almost surely, 2^{6918407998553} is an apocalyptic number.

It is an amenable number.

6918407998553 is a deficient number, since it is larger than the sum of its proper divisors (1).

6918407998553 is an equidigital number, since it uses as much as digits as its factorization.

6918407998553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 587865600, while the sum is 74.

The spelling of 6918407998553 in words is "six trillion, nine hundred eighteen billion, four hundred seven million, nine hundred ninety-eight thousand, five hundred fifty-three".