78298128361 has 2 divisors, whose sum is σ = 78298128362. Its totient is φ = 78298128360.

The previous prime is 78298128341. The next prime is 78298128431. The reversal of 78298128361 is 16382189287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51901952400 + 26396175961 = 227820^2 + 162469^2 .

It is an emirp because it is prime and its reverse (16382189287) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78298128361 is a prime.

It is a super-2 number, since 2×78298128361² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78298128341) 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, 39149064180 + 39149064181.

It is an arithmetic number, because the mean of its divisors is an integer number (39149064181).

Almost surely, 2^78298128361 is an apocalyptic number.

It is an amenable number.

78298128361 is a deficient number, since it is larger than the sum of its proper divisors (1).

78298128361 is an equidigital number, since it uses as much as digits as its factorization.

78298128361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 55.

The spelling of 78298128361 in words is "seventy-eight billion, two hundred ninety-eight million, one hundred twenty-eight thousand, three hundred sixty-one".