77825783249 has 4 divisors (see below), whose sum is σ = 77846435940. Its totient is φ = 77805130560.

The previous prime is 77825783227. The next prime is 77825783251. The reversal of 77825783249 is 94238752877.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38890600849 + 38935182400 = 197207^2 + 197320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77825783249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77825783191 and 77825783200.

It is not an unprimeable number, because it can be changed into a prime (77825783149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10320692 + ... + 10328229.

It is an arithmetic number, because the mean of its divisors is an integer number (19461608985).

Almost surely, 2^77825783249 is an apocalyptic number.

It is an amenable number.

77825783249 is a deficient number, since it is larger than the sum of its proper divisors (20652691).

77825783249 is a wasteful number, since it uses less digits than its factorization.

77825783249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20652690.

The product of its digits is 47416320, while the sum is 62.

The spelling of 77825783249 in words is "seventy-seven billion, eight hundred twenty-five million, seven hundred eighty-three thousand, two hundred forty-nine".