12776780017 has 4 divisors (see below), whose sum is σ = 13073914480. Its totient is φ = 12479645556.

The previous prime is 12776780011. The next prime is 12776780041. The reversal of 12776780017 is 71008767721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12776780017 is a prime.

It is a super-2 number, since 2×12776780017² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12776780011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148567167 + ... + 148567252.

It is an arithmetic number, because the mean of its divisors is an integer number (3268478620).

Almost surely, 2^12776780017 is an apocalyptic number.

It is an amenable number.

12776780017 is a deficient number, since it is larger than the sum of its proper divisors (297134463).

12776780017 is an equidigital number, since it uses as much as digits as its factorization.

12776780017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297134462.

The product of its (nonzero) digits is 230496, while the sum is 46.

The spelling of 12776780017 in words is "twelve billion, seven hundred seventy-six million, seven hundred eighty thousand, seventeen".