78535700061281 has 2 divisors, whose sum is σ = 78535700061282. Its totient is φ = 78535700061280.

The previous prime is 78535700061277. The next prime is 78535700061323. The reversal of 78535700061281 is 18216000753587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39841142016256 + 38694558045025 = 6311984^2 + 6220495^2 .

It is a cyclic number.

It is not a de Polignac number, because 78535700061281 - 2² = 78535700061277 is a prime.

It is a super-2 number, since 2×78535700061281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78535700061241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39267850030640 + 39267850030641.

It is an arithmetic number, because the mean of its divisors is an integer number (39267850030641).

Almost surely, 2^{78535700061281} is an apocalyptic number.

It is an amenable number.

78535700061281 is a deficient number, since it is larger than the sum of its proper divisors (1).

78535700061281 is an equidigital number, since it uses as much as digits as its factorization.

78535700061281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2822400, while the sum is 53.

The spelling of 78535700061281 in words is "seventy-eight trillion, five hundred thirty-five billion, seven hundred million, sixty-one thousand, two hundred eighty-one".