9978118747 has 2 divisors, whose sum is σ = 9978118748. Its totient is φ = 9978118746.

The previous prime is 9978118741. The next prime is 9978118837. The reversal of 9978118747 is 7478118799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9978118747 - 2¹⁵ = 9978085979 is a prime.

It is not a weakly prime, because it can be changed into another prime (9978118741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989059373 + 4989059374.

It is an arithmetic number, because the mean of its divisors is an integer number (4989059374).

Almost surely, 2^9978118747 is an apocalyptic number.

9978118747 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978118747 is an equidigital number, since it uses as much as digits as its factorization.

9978118747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7112448, while the sum is 61.

The square root of 9978118747 is about 99890.5338207780. The cubic root of 9978118747 is about 2152.8621514856.

The spelling of 9978118747 in words is "nine billion, nine hundred seventy-eight million, one hundred eighteen thousand, seven hundred forty-seven".