9977777669 has 2 divisors, whose sum is σ = 9977777670. Its totient is φ = 9977777668.

The previous prime is 9977777651. The next prime is 9977777723. The reversal of 9977777669 is 9667777799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7610468644 + 2367309025 = 87238^2 + 48655^2 .

It is a cyclic number.

It is not a de Polignac number, because 9977777669 - 2⁸ = 9977777413 is a prime.

It is a super-2 number, since 2×9977777669² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9977777596 and 9977777605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9977777569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4988888834 + 4988888835.

It is an arithmetic number, because the mean of its divisors is an integer number (4988888835).

Almost surely, 2^9977777669 is an apocalyptic number.

It is an amenable number.

9977777669 is a deficient number, since it is larger than the sum of its proper divisors (1).

9977777669 is an equidigital number, since it uses as much as digits as its factorization.

9977777669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 441082908, while the sum is 74.

The square root of 9977777669 is about 99888.8265473171. The cubic root of 9977777669 is about 2152.8376210672.

The spelling of 9977777669 in words is "nine billion, nine hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred sixty-nine".