66765256766 has 32 divisors (see below), whose sum is σ = 111952084608. Its totient is φ = 29664656640.

The previous prime is 66765256717. The next prime is 66765256787.

It is a happy number.

66765256766 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66765256766² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 66765256699 and 66765256708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373295 + ... + 522378.

It is an arithmetic number, because the mean of its divisors is an integer number (3498502644).

Almost surely, 2^66765256766 is an apocalyptic number.

66765256766 is a deficient number, since it is larger than the sum of its proper divisors (45186827842).

66765256766 is a wasteful number, since it uses less digits than its factorization.

66765256766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895796.

The product of its digits is 114307200, while the sum is 62.

The spelling of 66765256766 in words is "sixty-six billion, seven hundred sixty-five million, two hundred fifty-six thousand, seven hundred sixty-six".