78986985377 has 2 divisors, whose sum is σ = 78986985378. Its totient is φ = 78986985376.

The previous prime is 78986985373. The next prime is 78986985419. The reversal of 78986985377 is 77358968987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76640939281 + 2346046096 = 276841^2 + 48436^2 .

It is an emirp because it is prime and its reverse (77358968987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78986985377 - 2² = 78986985373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78986985298 and 78986985307.

It is not a weakly prime, because it can be changed into another prime (78986985373) 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, 39493492688 + 39493492689.

It is an arithmetic number, because the mean of its divisors is an integer number (39493492689).

Almost surely, 2^78986985377 is an apocalyptic number.

It is an amenable number.

78986985377 is a deficient number, since it is larger than the sum of its proper divisors (1).

78986985377 is an equidigital number, since it uses as much as digits as its factorization.

78986985377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1280240640, while the sum is 77.

The spelling of 78986985377 in words is "seventy-eight billion, nine hundred eighty-six million, nine hundred eighty-five thousand, three hundred seventy-seven".