999938446669 has 2 divisors, whose sum is σ = 999938446670. Its totient is φ = 999938446668.

The previous prime is 999938446649. The next prime is 999938446673. The reversal of 999938446669 is 966644839999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 979777286569 + 20161160100 = 989837^2 + 141990^2 .

It is an emirp because it is prime and its reverse (966644839999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999938446669 - 2¹¹ = 999938444621 is a prime.

It is a super-2 number, since 2×999938446669² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 999938446592 and 999938446601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999938446649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499969223334 + 499969223335.

It is an arithmetic number, because the mean of its divisors is an integer number (499969223335).

Almost surely, 2^999938446669 is an apocalyptic number.

999938446669 is the 577333-rd hex number.

It is an amenable number.

999938446669 is a deficient number, since it is larger than the sum of its proper divisors (1).

999938446669 is an equidigital number, since it uses as much as digits as its factorization.

999938446669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4897760256, while the sum is 82.

The spelling of 999938446669 in words is "nine hundred ninety-nine billion, nine hundred thirty-eight million, four hundred forty-six thousand, six hundred sixty-nine".