77579097577 has 4 divisors (see below), whose sum is σ = 78347207556. Its totient is φ = 76810987600.

The previous prime is 77579097509. The next prime is 77579097587.

77579097577 is nontrivially palindromic in base 10.

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 62485500841 + 15093596736 = 249971^2 + 122856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77579097577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77579097587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384054838 + ... + 384055039.

It is an arithmetic number, because the mean of its divisors is an integer number (19586801889).

Almost surely, 2^77579097577 is an apocalyptic number.

It is an amenable number.

77579097577 is a deficient number, since it is larger than the sum of its proper divisors (768109979).

77579097577 is a wasteful number, since it uses less digits than its factorization.

77579097577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768109978.

The product of its (nonzero) digits is 238239225, while the sum is 70.

The spelling of 77579097577 in words is "seventy-seven billion, five hundred seventy-nine million, ninety-seven thousand, five hundred seventy-seven".