12666020077 has 8 divisors (see below), whose sum is σ = 13104093240. Its totient is φ = 12228034560.

The previous prime is 12666020057. The next prime is 12666020093. The reversal of 12666020077 is 77002066621.

It can be written as a sum of positive squares in 4 ways, for example, as 2802749481 + 9863270596 = 52941^2 + 99314^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12666020077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666020047) 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, 431253 + ... + 459685.

It is an arithmetic number, because the mean of its divisors is an integer number (1638011655).

Almost surely, 2^12666020077 is an apocalyptic number.

It is an amenable number.

12666020077 is a deficient number, since it is larger than the sum of its proper divisors (438073163).

12666020077 is a wasteful number, since it uses less digits than its factorization.

12666020077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43823.

The product of its (nonzero) digits is 42336, while the sum is 37.

Adding to 12666020077 its reverse (77002066621), we get a palindrome (89668086698).

The spelling of 12666020077 in words is "twelve billion, six hundred sixty-six million, twenty thousand, seventy-seven".