77011531809 has 4 divisors (see below), whose sum is σ = 102682042416. Its totient is φ = 51341021204.

The previous prime is 77011531789. The next prime is 77011531837. The reversal of 77011531809 is 90813511077.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 77011531809 - 2¹² = 77011527713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77011531889) 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, 12835255299 + ... + 12835255304.

It is an arithmetic number, because the mean of its divisors is an integer number (25670510604).

Almost surely, 2^77011531809 is an apocalyptic number.

It is an amenable number.

77011531809 is a deficient number, since it is larger than the sum of its proper divisors (25670510607).

77011531809 is a wasteful number, since it uses less digits than its factorization.

77011531809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25670510606.

The product of its (nonzero) digits is 52920, while the sum is 42.

The spelling of 77011531809 in words is "seventy-seven billion, eleven million, five hundred thirty-one thousand, eight hundred nine".