77399566668 has 18 divisors (see below), whose sum is σ = 195648904724. Its totient is φ = 25799855544.

The previous prime is 77399566661. The next prime is 77399566687. The reversal of 77399566668 is 86666599377.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 77399566596 and 77399566605.

It is not an unprimeable number, because it can be changed into a prime (77399566661) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 1074993946 + ... + 1074994017.

Almost surely, 2^77399566668 is an apocalyptic number.

It is an amenable number.

77399566668 is an abundant number, since it is smaller than the sum of its proper divisors (118249338056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77399566668 is a wasteful number, since it uses less digits than its factorization.

77399566668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149987973 (or 2149987968 counting only the distinct ones).

The product of its digits is 617258880, while the sum is 72.

The spelling of 77399566668 in words is "seventy-seven billion, three hundred ninety-nine million, five hundred sixty-six thousand, six hundred sixty-eight".