66775257766 has 16 divisors (see below), whose sum is σ = 115605257760. Its totient is φ = 28334620800.

The previous prime is 66775257713. The next prime is 66775257793.

66775257766 is nontrivially palindromic in base 10.

66775257766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 66775257698 and 66775257707.

It is a congruent number.

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, 23610771 + ... + 23613598.

It is an arithmetic number, because the mean of its divisors is an integer number (7225328610).

Almost surely, 2^66775257766 is an apocalyptic number.

66775257766 is a deficient number, since it is larger than the sum of its proper divisors (48829999994).

66775257766 is a wasteful number, since it uses less digits than its factorization.

66775257766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47224479.

The product of its digits is 155584800, while the sum is 64.

The spelling of 66775257766 in words is "sixty-six billion, seven hundred seventy-five million, two hundred fifty-seven thousand, seven hundred sixty-six".