78205051241 has 2 divisors, whose sum is σ = 78205051242. Its totient is φ = 78205051240.

The previous prime is 78205051229. The next prime is 78205051273. The reversal of 78205051241 is 14215050287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78192377641 + 12673600 = 279629^2 + 3560^2 .

It is an emirp because it is prime and its reverse (14215050287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78205051241 - 2¹⁴ = 78205034857 is a prime.

It is a super-2 number, since 2×78205051241² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78205351241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39102525620 + 39102525621.

It is an arithmetic number, because the mean of its divisors is an integer number (39102525621).

Almost surely, 2^78205051241 is an apocalyptic number.

It is an amenable number.

78205051241 is a deficient number, since it is larger than the sum of its proper divisors (1).

78205051241 is an equidigital number, since it uses as much as digits as its factorization.

78205051241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22400, while the sum is 35.

The spelling of 78205051241 in words is "seventy-eight billion, two hundred five million, fifty-one thousand, two hundred forty-one".