77522475521 has 4 divisors (see below), whose sum is σ = 77534261844. Its totient is φ = 77510689200.

The previous prime is 77522475473. The next prime is 77522475533. The reversal of 77522475521 is 12557422577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12557422577 = 7 ⋅1793917511.

It can be written as a sum of positive squares in 2 ways, for example, as 32944065025 + 44578410496 = 181505^2 + 211136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77522475521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77522475551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5883290 + ... + 5896451.

It is an arithmetic number, because the mean of its divisors is an integer number (19383565461).

Almost surely, 2^77522475521 is an apocalyptic number.

It is an amenable number.

77522475521 is a deficient number, since it is larger than the sum of its proper divisors (11786323).

77522475521 is a wasteful number, since it uses less digits than its factorization.

77522475521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11786322.

The product of its digits is 1372000, while the sum is 47.

The spelling of 77522475521 in words is "seventy-seven billion, five hundred twenty-two million, four hundred seventy-five thousand, five hundred twenty-one".