1678620792049 has 2 divisors, whose sum is σ = 1678620792050. Its totient is φ = 1678620792048.

The previous prime is 1678620791987. The next prime is 1678620792059. The reversal of 1678620792049 is 9402970268761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1544382823824 + 134237968225 = 1242732^2 + 366385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678620792049 - 2¹¹ = 1678620790001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1678620792059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839310396024 + 839310396025.

It is an arithmetic number, because the mean of its divisors is an integer number (839310396025).

Almost surely, 2^{1678620792049} is an apocalyptic number.

It is an amenable number.

1678620792049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678620792049 is an equidigital number, since it uses as much as digits as its factorization.

1678620792049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18289152, while the sum is 61.

The spelling of 1678620792049 in words is "one trillion, six hundred seventy-eight billion, six hundred twenty million, seven hundred ninety-two thousand, forty-nine".