699818818669 has 2 divisors, whose sum is σ = 699818818670. Its totient is φ = 699818818668.

The previous prime is 699818818667. The next prime is 699818818717. The reversal of 699818818669 is 966818818996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 623725596169 + 76093222500 = 789763^2 + 275850^2 .

It is a cyclic number.

It is not a de Polignac number, because 699818818669 - 2¹ = 699818818667 is a prime.

It is a super-2 number, since 2×699818818669² (a number of 24 digits) contains 22 as substring.

Together with 699818818667, it forms a pair of twin primes.

699818818669 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699818818667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349909409334 + 349909409335.

It is an arithmetic number, because the mean of its divisors is an integer number (349909409335).

Almost surely, 2^699818818669 is an apocalyptic number.

It is an amenable number.

699818818669 is a deficient number, since it is larger than the sum of its proper divisors (1).

699818818669 is an equidigital number, since it uses as much as digits as its factorization.

699818818669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 644972544, while the sum is 79.

The spelling of 699818818669 in words is "six hundred ninety-nine billion, eight hundred eighteen million, eight hundred eighteen thousand, six hundred sixty-nine".