12778170959 has 4 divisors (see below), whose sum is σ = 12778524504. Its totient is φ = 12777817416.

The previous prime is 12778170949. The next prime is 12778170983. The reversal of 12778170959 is 95907187721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12778170959 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 (12778170949) 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, 115472 + ... + 197205.

It is an arithmetic number, because the mean of its divisors is an integer number (3194631126).

Almost surely, 2^12778170959 is an apocalyptic number.

12778170959 is a deficient number, since it is larger than the sum of its proper divisors (353545).

12778170959 is an equidigital number, since it uses as much as digits as its factorization.

12778170959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353544.

The product of its (nonzero) digits is 2222640, while the sum is 56.

The spelling of 12778170959 in words is "twelve billion, seven hundred seventy-eight million, one hundred seventy thousand, nine hundred fifty-nine".