79769077049 has 4 divisors (see below), whose sum is σ = 80117413860. Its totient is φ = 79420740240.

The previous prime is 79769077021. The next prime is 79769077079. The reversal of 79769077049 is 94077096797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94077096797 = 1621 ⋅58036457.

It can be written as a sum of positive squares in 2 ways, for example, as 70604461225 + 9164615824 = 265715^2 + 95732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79769077049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79769077009) 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 3 ways as a sum of consecutive naturals, for example, 174168062 + ... + 174168519.

It is an arithmetic number, because the mean of its divisors is an integer number (20029353465).

Almost surely, 2^79769077049 is an apocalyptic number.

It is an amenable number.

79769077049 is a deficient number, since it is larger than the sum of its proper divisors (348336811).

79769077049 is a wasteful number, since it uses less digits than its factorization.

79769077049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348336810.

The product of its (nonzero) digits is 42007896, while the sum is 65.

The spelling of 79769077049 in words is "seventy-nine billion, seven hundred sixty-nine million, seventy-seven thousand, forty-nine".