77777550066 has 8 divisors (see below), whose sum is σ = 155555100144. Its totient is φ = 25925850020.

The previous prime is 77777550049. The next prime is 77777550127. The reversal of 77777550066 is 66005577777.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

77777550066 is an admirable number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 77777549988 and 77777550015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6481462500 + ... + 6481462511.

It is an arithmetic number, because the mean of its divisors is an integer number (19444387518).

Almost surely, 2^77777550066 is an apocalyptic number.

77777550066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

77777550066 is a wasteful number, since it uses less digits than its factorization.

77777550066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12962925016.

The product of its (nonzero) digits is 15126300, while the sum is 57.

The spelling of 77777550066 in words is "seventy-seven billion, seven hundred seventy-seven million, five hundred fifty thousand, sixty-six".