1978549446953 has 2 divisors, whose sum is σ = 1978549446954. Its totient is φ = 1978549446952.

The previous prime is 1978549446941. The next prime is 1978549446959. The reversal of 1978549446953 is 3596449458791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1398100502569 + 580448944384 = 1182413^2 + 761872^2 .

It is a cyclic number.

It is not a de Polignac number, because 1978549446953 - 2⁶ = 1978549446889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1978549446959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989274723476 + 989274723477.

It is an arithmetic number, because the mean of its divisors is an integer number (989274723477).

Almost surely, 2^{1978549446953} is an apocalyptic number.

It is an amenable number.

1978549446953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978549446953 is an equidigital number, since it uses as much as digits as its factorization.

1978549446953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1175731200, while the sum is 74.

The spelling of 1978549446953 in words is "one trillion, nine hundred seventy-eight billion, five hundred forty-nine million, four hundred forty-six thousand, nine hundred fifty-three".