78882036177391 has 2 divisors, whose sum is σ = 78882036177392. Its totient is φ = 78882036177390.

The previous prime is 78882036177317. The next prime is 78882036177407. The reversal of 78882036177391 is 19377163028887.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78882036177391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78882036177391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78882036177691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39441018088695 + 39441018088696.

It is an arithmetic number, because the mean of its divisors is an integer number (39441018088696).

Almost surely, 2^{78882036177391} is an apocalyptic number.

78882036177391 is a deficient number, since it is larger than the sum of its proper divisors (1).

78882036177391 is an equidigital number, since it uses as much as digits as its factorization.

78882036177391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170698752, while the sum is 70.

The spelling of 78882036177391 in words is "seventy-eight trillion, eight hundred eighty-two billion, thirty-six million, one hundred seventy-seven thousand, three hundred ninety-one".