1978358414771 has 2 divisors, whose sum is σ = 1978358414772. Its totient is φ = 1978358414770.

The previous prime is 1978358414731. The next prime is 1978358414779. The reversal of 1978358414771 is 1774148538791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1978358414771 - 2¹⁰ = 1978358413747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1978358414698 and 1978358414707.

It is not a weakly prime, because it can be changed into another prime (1978358414779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989179207385 + 989179207386.

It is an arithmetic number, because the mean of its divisors is an integer number (989179207386).

Almost surely, 2^{1978358414771} is an apocalyptic number.

1978358414771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978358414771 is an equidigital number, since it uses as much as digits as its factorization.

1978358414771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47416320, while the sum is 65.

The spelling of 1978358414771 in words is "one trillion, nine hundred seventy-eight billion, three hundred fifty-eight million, four hundred fourteen thousand, seven hundred seventy-one".