6918775769 has 2 divisors, whose sum is σ = 6918775770. Its totient is φ = 6918775768.

The previous prime is 6918775741. The next prime is 6918775783. The reversal of 6918775769 is 9675778196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5066592400 + 1852183369 = 71180^2 + 43037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6918775769 is a prime.

It is a super-2 number, since 2×6918775769² = 95738916283403082722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6918775739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459387884 + 3459387885.

It is an arithmetic number, because the mean of its divisors is an integer number (3459387885).

Almost surely, 2^6918775769 is an apocalyptic number.

It is an amenable number.

6918775769 is a deficient number, since it is larger than the sum of its proper divisors (1).

6918775769 is an equidigital number, since it uses as much as digits as its factorization.

6918775769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40007520, while the sum is 65.

The square root of 6918775769 is about 83179.1786987585. The cubic root of 6918775769 is about 1905.5035048461.

The spelling of 6918775769 in words is "six billion, nine hundred eighteen million, seven hundred seventy-five thousand, seven hundred sixty-nine".