69778687819 has 2 divisors, whose sum is σ = 69778687820. Its totient is φ = 69778687818.

The previous prime is 69778687787. The next prime is 69778687829. The reversal of 69778687819 is 91878687796.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 69778687819 - 2⁵ = 69778687787 is a prime.

It is a super-2 number, since 2×69778687819² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (69778687829) 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, 34889343909 + 34889343910.

It is an arithmetic number, because the mean of its divisors is an integer number (34889343910).

Almost surely, 2^69778687819 is an apocalyptic number.

69778687819 is a deficient number, since it is larger than the sum of its proper divisors (1).

69778687819 is an equidigital number, since it uses as much as digits as its factorization.

69778687819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512096256, while the sum is 76.

The spelling of 69778687819 in words is "sixty-nine billion, seven hundred seventy-eight million, six hundred eighty-seven thousand, eight hundred nineteen".