77766666 has 16 divisors (see below), whose sum is σ = 155641824. Its totient is φ = 25904144.

The previous prime is 77766641. The next prime is 77766673. The reversal of 77766666 is 66666777.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7096 + ... + 14348.

It is an arithmetic number, because the mean of its divisors is an integer number (9727614).

Almost surely, 2^77766666 is an apocalyptic number.

77766666 is an abundant number, since it is smaller than the sum of its proper divisors (77875158).

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

77766666 is a wasteful number, since it uses less digits than its factorization.

77766666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9045.

The product of its digits is 2667168, while the sum is 51.

The square root of 77766666 is about 8818.5410357950. The cubic root of 77766666 is about 426.8393928214.

The spelling of 77766666 in words is "seventy-seven million, seven hundred sixty-six thousand, six hundred sixty-six".