78855235888441 has 2 divisors, whose sum is σ = 78855235888442. Its totient is φ = 78855235888440.

The previous prime is 78855235888439. The next prime is 78855235888459. The reversal of 78855235888441 is 14488853255887.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76672439438400 + 2182796450041 = 8756280^2 + 1477429^2 .

It is a cyclic number.

It is not a de Polignac number, because 78855235888441 - 2¹ = 78855235888439 is a prime.

Together with 78855235888439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78855235888421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39427617944220 + 39427617944221.

It is an arithmetic number, because the mean of its divisors is an integer number (39427617944221).

Almost surely, 2^{78855235888441} is an apocalyptic number.

It is an amenable number.

78855235888441 is a deficient number, since it is larger than the sum of its proper divisors (1).

78855235888441 is an equidigital number, since it uses as much as digits as its factorization.

78855235888441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2752512000, while the sum is 76.

The spelling of 78855235888441 in words is "seventy-eight trillion, eight hundred fifty-five billion, two hundred thirty-five million, eight hundred eighty-eight thousand, four hundred forty-one".