76819678666 has 4 divisors (see below), whose sum is σ = 115229518002. Its totient is φ = 38409839332.

The previous prime is 76819678633. The next prime is 76819678709. The reversal of 76819678666 is 66687691867.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66687691867 = 47 ⋅1418887061.

It can be written as a sum of positive squares in only one way, i.e., 42215866225 + 34603812441 = 205465^2 + 186021^2 .

It is a junction number, because it is equal to n+sod(n) for n = 76819678595 and 76819678604.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19204919665 + ... + 19204919668.

Almost surely, 2^76819678666 is an apocalyptic number.

76819678666 is a deficient number, since it is larger than the sum of its proper divisors (38409839336).

76819678666 is a wasteful number, since it uses less digits than its factorization.

76819678666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38409839335.

The product of its digits is 219469824, while the sum is 70.

The spelling of 76819678666 in words is "seventy-six billion, eight hundred nineteen million, six hundred seventy-eight thousand, six hundred sixty-six".