18978979282243 has 2 divisors, whose sum is σ = 18978979282244. Its totient is φ = 18978979282242.

The previous prime is 18978979282217. The next prime is 18978979282261. The reversal of 18978979282243 is 34228297987981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18978979282243 is a prime.

It is a super-2 number, since 2×18978979282243² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18978979282273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489489641121 + 9489489641122.

It is an arithmetic number, because the mean of its divisors is an integer number (9489489641122).

Almost surely, 2^{18978979282243} is an apocalyptic number.

18978979282243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18978979282243 is an equidigital number, since it uses as much as digits as its factorization.

18978979282243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1755758592, while the sum is 79.

The spelling of 18978979282243 in words is "eighteen trillion, nine hundred seventy-eight billion, nine hundred seventy-nine million, two hundred eighty-two thousand, two hundred forty-three".