1393995778547 has 2 divisors, whose sum is σ = 1393995778548. Its totient is φ = 1393995778546.

The previous prime is 1393995778531. The next prime is 1393995778601. The reversal of 1393995778547 is 7458775993931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1393995778547 - 2⁴ = 1393995778531 is a prime.

It is not a weakly prime, because it can be changed into another prime (1393995778247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696997889273 + 696997889274.

It is an arithmetic number, because the mean of its divisors is an integer number (696997889274).

Almost surely, 2^{1393995778547} is an apocalyptic number.

1393995778547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393995778547 is an equidigital number, since it uses as much as digits as its factorization.

1393995778547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800338400, while the sum is 77.

The spelling of 1393995778547 in words is "one trillion, three hundred ninety-three billion, nine hundred ninety-five million, seven hundred seventy-eight thousand, five hundred forty-seven".