78511217041 has 2 divisors, whose sum is σ = 78511217042. Its totient is φ = 78511217040.

The previous prime is 78511216957. The next prime is 78511217087. The reversal of 78511217041 is 14071211587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59241612816 + 19269604225 = 243396^2 + 138815^2 .

It is an emirp because it is prime and its reverse (14071211587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78511217041 - 2¹³ = 78511208849 is a prime.

It is a super-2 number, since 2×78511217041² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78511017041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39255608520 + 39255608521.

It is an arithmetic number, because the mean of its divisors is an integer number (39255608521).

Almost surely, 2^78511217041 is an apocalyptic number.

It is an amenable number.

78511217041 is a deficient number, since it is larger than the sum of its proper divisors (1).

78511217041 is an equidigital number, since it uses as much as digits as its factorization.

78511217041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 37.

The spelling of 78511217041 in words is "seventy-eight billion, five hundred eleven million, two hundred seventeen thousand, forty-one".