43278626113781 has 2 divisors, whose sum is σ = 43278626113782. Its totient is φ = 43278626113780.

The previous prime is 43278626113777. The next prime is 43278626113787. The reversal of 43278626113781 is 18731162687234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37935436680625 + 5343189433156 = 6159175^2 + 2311534^2 .

It is a cyclic number.

It is not a de Polignac number, because 43278626113781 - 2² = 43278626113777 is a prime.

It is a super-2 number, since 2×43278626113781² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43278626113781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43278626113787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21639313056890 + 21639313056891.

It is an arithmetic number, because the mean of its divisors is an integer number (21639313056891).

Almost surely, 2^{43278626113781} is an apocalyptic number.

It is an amenable number.

43278626113781 is a deficient number, since it is larger than the sum of its proper divisors (1).

43278626113781 is an equidigital number, since it uses as much as digits as its factorization.

43278626113781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16257024, while the sum is 59.

The spelling of 43278626113781 in words is "forty-three trillion, two hundred seventy-eight billion, six hundred twenty-six million, one hundred thirteen thousand, seven hundred eighty-one".