78206919041 has 2 divisors, whose sum is σ = 78206919042. Its totient is φ = 78206919040.

The previous prime is 78206919001. The next prime is 78206919073. The reversal of 78206919041 is 14091960287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78206919025 + 16 = 279655^2 + 4^2 .

It is an emirp because it is prime and its reverse (14091960287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78206919041 - 2¹⁸ = 78206656897 is a prime.

It is a super-2 number, since 2×78206919041² (a number of 23 digits) contains 22 as substring.

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 (78206919001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39103459520 + 39103459521.

It is an arithmetic number, because the mean of its divisors is an integer number (39103459521).

Almost surely, 2^78206919041 is an apocalyptic number.

It is an amenable number.

78206919041 is a deficient number, since it is larger than the sum of its proper divisors (1).

78206919041 is an equidigital number, since it uses as much as digits as its factorization.

78206919041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 78206919041 in words is "seventy-eight billion, two hundred six million, nine hundred nineteen thousand, forty-one".