1968818947 has 2 divisors, whose sum is σ = 1968818948. Its totient is φ = 1968818946.

The previous prime is 1968818933. The next prime is 1968819109. The reversal of 1968818947 is 7498188691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1968818947 - 2¹⁵ = 1968786179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1968818927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984409473 + 984409474.

It is an arithmetic number, because the mean of its divisors is an integer number (984409474).

Almost surely, 2^1968818947 is an apocalyptic number.

1968818947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968818947 is an equidigital number, since it uses as much as digits as its factorization.

1968818947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 61.

The square root of 1968818947 is about 44371.3753111170. The cubic root of 1968818947 is about 1253.3391143366.

The spelling of 1968818947 in words is "one billion, nine hundred sixty-eight million, eight hundred eighteen thousand, nine hundred forty-seven".