1843978478977 has 2 divisors, whose sum is σ = 1843978478978. Its totient is φ = 1843978478976.

The previous prime is 1843978478813. The next prime is 1843978479139. The reversal of 1843978478977 is 7798748793481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1837987564176 + 5990914801 = 1355724^2 + 77401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1843978478977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1843978478977.

It is not a weakly prime, because it can be changed into another prime (1843978478077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921989239488 + 921989239489.

It is an arithmetic number, because the mean of its divisors is an integer number (921989239489).

Almost surely, 2^{1843978478977} is an apocalyptic number.

It is an amenable number.

1843978478977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1843978478977 is an equidigital number, since it uses as much as digits as its factorization.

1843978478977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4779565056, while the sum is 82.

The spelling of 1843978478977 in words is "one trillion, eight hundred forty-three billion, nine hundred seventy-eight million, four hundred seventy-eight thousand, nine hundred seventy-seven".