66777500577766 has 16 divisors (see below), whose sum is σ = 109273100751360. Its totient is φ = 30353179609480.

The previous prime is 66777500577763. The next prime is 66777500577791.

66777500577766 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66777500577692 and 66777500577701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66777500577761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8497246 + ... + 14344273.

It is an arithmetic number, because the mean of its divisors is an integer number (6829568796960).

Almost surely, 2^{66777500577766} is an apocalyptic number.

66777500577766 is a deficient number, since it is larger than the sum of its proper divisors (42495600173594).

66777500577766 is a wasteful number, since it uses less digits than its factorization.

66777500577766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22974419.

The product of its (nonzero) digits is 3811827600, while the sum is 76.

The spelling of 66777500577766 in words is "sixty-six trillion, seven hundred seventy-seven billion, five hundred million, five hundred seventy-seven thousand, seven hundred sixty-six".