77145113809 has 4 divisors (see below), whose sum is σ = 80499249216. Its totient is φ = 73790978404.

The previous prime is 77145113789. The next prime is 77145113821. The reversal of 77145113809 is 90831154177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90831154177 = 28211 ⋅3219707.

It is a cyclic number.

It is not a de Polignac number, because 77145113809 - 2¹¹ = 77145111761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77145113879) 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, 1677067669 + ... + 1677067714.

It is an arithmetic number, because the mean of its divisors is an integer number (20124812304).

Almost surely, 2^77145113809 is an apocalyptic number.

It is an amenable number.

77145113809 is a deficient number, since it is larger than the sum of its proper divisors (3354135407).

77145113809 is a wasteful number, since it uses less digits than its factorization.

77145113809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3354135406.

The product of its (nonzero) digits is 211680, while the sum is 46.

The spelling of 77145113809 in words is "seventy-seven billion, one hundred forty-five million, one hundred thirteen thousand, eight hundred nine".