78220412383577 has 2 divisors, whose sum is σ = 78220412383578. Its totient is φ = 78220412383576.

The previous prime is 78220412383543. The next prime is 78220412383627. The reversal of 78220412383577 is 77538321402287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43865996705881 + 34354415677696 = 6623141^2 + 5861264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78220412383577 is a prime.

It is a super-2 number, since 2×78220412383577² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78220412383507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39110206191788 + 39110206191789.

It is an arithmetic number, because the mean of its divisors is an integer number (39110206191789).

Almost surely, 2^{78220412383577} is an apocalyptic number.

It is an amenable number.

78220412383577 is a deficient number, since it is larger than the sum of its proper divisors (1).

78220412383577 is an equidigital number, since it uses as much as digits as its factorization.

78220412383577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31610880, while the sum is 59.

The spelling of 78220412383577 in words is "seventy-eight trillion, two hundred twenty billion, four hundred twelve million, three hundred eighty-three thousand, five hundred seventy-seven".