77550405577 has 4 divisors (see below), whose sum is σ = 78303322240. Its totient is φ = 76797488916.

The previous prime is 77550405523. The next prime is 77550405601.

77550405577 is nontrivially palindromic in base 10.

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 77550405577 - 2¹¹ = 77550403529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77550405077) 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, 376458177 + ... + 376458382.

It is an arithmetic number, because the mean of its divisors is an integer number (19575830560).

Almost surely, 2^77550405577 is an apocalyptic number.

It is an amenable number.

77550405577 is a deficient number, since it is larger than the sum of its proper divisors (752916663).

77550405577 is a wasteful number, since it uses less digits than its factorization.

77550405577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752916662.

The product of its (nonzero) digits is 6002500, while the sum is 52.

The spelling of 77550405577 in words is "seventy-seven billion, five hundred fifty million, four hundred five thousand, five hundred seventy-seven".