1547778478451 has 2 divisors, whose sum is σ = 1547778478452. Its totient is φ = 1547778478450.

The previous prime is 1547778478397. The next prime is 1547778478487. The reversal of 1547778478451 is 1548748777451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1547778478451 - 2¹⁸ = 1547778216307 is a prime.

It is not a weakly prime, because it can be changed into another prime (1547778448451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 773889239225 + 773889239226.

It is an arithmetic number, because the mean of its divisors is an integer number (773889239226).

Almost surely, 2^{1547778478451} is an apocalyptic number.

1547778478451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1547778478451 is an equidigital number, since it uses as much as digits as its factorization.

1547778478451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 245862400, while the sum is 68.

Subtracting 1547778478451 from its reverse (1548748777451), we obtain a cube (970299000 = 990³).

The spelling of 1547778478451 in words is "one trillion, five hundred forty-seven billion, seven hundred seventy-eight million, four hundred seventy-eight thousand, four hundred fifty-one".