1978549446959 has 2 divisors, whose sum is σ = 1978549446960. Its totient is φ = 1978549446958.

The previous prime is 1978549446953. The next prime is 1978549447003. The reversal of 1978549446959 is 9596449458791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1978549446959 - 2¹⁶ = 1978549381423 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978549446953) 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, 989274723479 + 989274723480.

It is an arithmetic number, because the mean of its divisors is an integer number (989274723480).

Almost surely, 2^{1978549446959} is an apocalyptic number.

1978549446959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978549446959 is an equidigital number, since it uses as much as digits as its factorization.

1978549446959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3527193600, while the sum is 80.

The spelling of 1978549446959 in words is "one trillion, nine hundred seventy-eight billion, five hundred forty-nine million, four hundred forty-six thousand, nine hundred fifty-nine".