77563146818 has 4 divisors (see below), whose sum is σ = 116344720230. Its totient is φ = 38781573408.

The previous prime is 77563146809. The next prime is 77563146839. The reversal of 77563146818 is 81864136577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81864136577 = 6199 ⋅13206023.

It can be written as a sum of positive squares in only one way, i.e., 61363712089 + 16199434729 = 247717^2 + 127277^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19390786703 + ... + 19390786706.

Almost surely, 2^77563146818 is an apocalyptic number.

77563146818 is a deficient number, since it is larger than the sum of its proper divisors (38781573412).

77563146818 is a wasteful number, since it uses less digits than its factorization.

77563146818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38781573411.

The product of its digits is 6773760, while the sum is 56.

The spelling of 77563146818 in words is "seventy-seven billion, five hundred sixty-three million, one hundred forty-six thousand, eight hundred eighteen".