78226773281 has 2 divisors, whose sum is σ = 78226773282. Its totient is φ = 78226773280.

The previous prime is 78226773227. The next prime is 78226773307. The reversal of 78226773281 is 18237762287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76198081600 + 2028691681 = 276040^2 + 45041^2 .

It is a cyclic number.

It is not a de Polignac number, because 78226773281 - 2⁶ = 78226773217 is a prime.

It is a super-3 number, since 3×78226773281³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78226773481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39113386640 + 39113386641.

It is an arithmetic number, because the mean of its divisors is an integer number (39113386641).

Almost surely, 2^78226773281 is an apocalyptic number.

It is an amenable number.

78226773281 is a deficient number, since it is larger than the sum of its proper divisors (1).

78226773281 is an equidigital number, since it uses as much as digits as its factorization.

78226773281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3161088, while the sum is 53.

The spelling of 78226773281 in words is "seventy-eight billion, two hundred twenty-six million, seven hundred seventy-three thousand, two hundred eighty-one".