77554645577 has 4 divisors (see below), whose sum is σ = 78002938500. Its totient is φ = 77106352656.

The previous prime is 77554645549. The next prime is 77554645579.

77554645577 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 51793111561 + 25761534016 = 227581^2 + 160504^2 .

It is a cyclic number.

It is not a de Polignac number, because 77554645577 - 2⁶ = 77554645513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77554645579) 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, 224146202 + ... + 224146547.

It is an arithmetic number, because the mean of its divisors is an integer number (19500734625).

Almost surely, 2^77554645577 is an apocalyptic number.

It is an amenable number.

77554645577 is a deficient number, since it is larger than the sum of its proper divisors (448292923).

77554645577 is a wasteful number, since it uses less digits than its factorization.

77554645577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448292922.

The product of its digits is 144060000, while the sum is 62.

The spelling of 77554645577 in words is "seventy-seven billion, five hundred fifty-four million, six hundred forty-five thousand, five hundred seventy-seven".