77666476612 has 6 divisors (see below), whose sum is σ = 135916334078. Its totient is φ = 38833238304.

The previous prime is 77666476549. The next prime is 77666476673. The reversal of 77666476612 is 21667466677.

It can be written as a sum of positive squares in only one way, i.e., 76454462016 + 1212014596 = 276504^2 + 34814^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9708309573 + ... + 9708309580.

Almost surely, 2^77666476612 is an apocalyptic number.

It is an amenable number.

77666476612 is a deficient number, since it is larger than the sum of its proper divisors (58249857466).

77666476612 is a wasteful number, since it uses less digits than its factorization.

77666476612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19416619157 (or 19416619155 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 58.

The spelling of 77666476612 in words is "seventy-seven billion, six hundred sixty-six million, four hundred seventy-six thousand, six hundred twelve".