69778687797 has 144 divisors (see below), whose sum is σ = 131002954992. Its totient is φ = 35446118400.

The previous prime is 69778687787. The next prime is 69778687819. The reversal of 69778687797 is 79778687796.

It can be written as a sum of positive squares in 8 ways, for example, as 17469966276 + 52308721521 = 132174^2 + 228711^2 .

It is not a de Polignac number, because 69778687797 - 2⁷ = 69778687669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69778687787) 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 in 143 ways as a sum of consecutive naturals, for example, 21422593 + ... + 21425849.

It is an arithmetic number, because the mean of its divisors is an integer number (909742743).

Almost surely, 2^69778687797 is an apocalyptic number.

It is an amenable number.

69778687797 is a deficient number, since it is larger than the sum of its proper divisors (61224267195).

69778687797 is a wasteful number, since it uses less digits than its factorization.

69778687797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3428 (or 3418 counting only the distinct ones).

The product of its digits is 3136589568, while the sum is 81.

Subtracting 69778687797 from its reverse (79778687796), we obtain a palindrome (9999999999).

The spelling of 69778687797 in words is "sixty-nine billion, seven hundred seventy-eight million, six hundred eighty-seven thousand, seven hundred ninety-seven".