66773666708 has 18 divisors (see below), whose sum is σ = 135932107626. Its totient is φ = 28617285648.

The previous prime is 66773666693. The next prime is 66773666777. The reversal of 66773666708 is 80766637766.

It can be written as a sum of positive squares in only one way, i.e., 65796354064 + 977312644 = 256508^2 + 31262^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 170340791 + ... + 170341182.

It is an arithmetic number, because the mean of its divisors is an integer number (7551783757).

Almost surely, 2^66773666708 is an apocalyptic number.

It is an amenable number.

66773666708 is an abundant number, since it is smaller than the sum of its proper divisors (69158440918).

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

66773666708 is a wasteful number, since it uses less digits than its factorization.

66773666708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340681991 (or 340681982 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 62.

The spelling of 66773666708 in words is "sixty-six billion, seven hundred seventy-three million, six hundred sixty-six thousand, seven hundred eight".