69778687669 has 2 divisors, whose sum is σ = 69778687670. Its totient is φ = 69778687668.

The previous prime is 69778687549. The next prime is 69778687673. The reversal of 69778687669 is 96678687796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69241607044 + 537080625 = 263138^2 + 23175^2 .

It is a cyclic number.

It is not a de Polignac number, because 69778687669 - 2⁷ = 69778687541 is a prime.

It is a super-2 number, since 2×69778687669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69778681669) 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, 34889343834 + 34889343835.

It is an arithmetic number, because the mean of its divisors is an integer number (34889343835).

Almost surely, 2^69778687669 is an apocalyptic number.

It is an amenable number.

69778687669 is a deficient number, since it is larger than the sum of its proper divisors (1).

69778687669 is an equidigital number, since it uses as much as digits as its factorization.

69778687669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304433152, while the sum is 79.

The spelling of 69778687669 in words is "sixty-nine billion, seven hundred seventy-eight million, six hundred eighty-seven thousand, six hundred sixty-nine".