78790982381 has 2 divisors, whose sum is σ = 78790982382. Its totient is φ = 78790982380.

The previous prime is 78790982363. The next prime is 78790982419. The reversal of 78790982381 is 18328909787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75574958281 + 3216024100 = 274909^2 + 56710^2 .

It is an emirp because it is prime and its reverse (18328909787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78790982381 - 2²² = 78786788077 is a prime.

It is a super-2 number, since 2×78790982381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78790982351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39395491190 + 39395491191.

It is an arithmetic number, because the mean of its divisors is an integer number (39395491191).

Almost surely, 2^78790982381 is an apocalyptic number.

It is an amenable number.

78790982381 is a deficient number, since it is larger than the sum of its proper divisors (1).

78790982381 is an equidigital number, since it uses as much as digits as its factorization.

78790982381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12192768, while the sum is 62.

The spelling of 78790982381 in words is "seventy-eight billion, seven hundred ninety million, nine hundred eighty-two thousand, three hundred eighty-one".