8889663947 has 2 divisors, whose sum is σ = 8889663948. Its totient is φ = 8889663946.

The previous prime is 8889663941. The next prime is 8889663971. The reversal of 8889663947 is 7493669888.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8889663947 - 2¹⁶ = 8889598411 is a prime.

It is a super-2 number, since 2×8889663947² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8889663941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4444831973 + 4444831974.

It is an arithmetic number, because the mean of its divisors is an integer number (4444831974).

Almost surely, 2^8889663947 is an apocalyptic number.

8889663947 is a deficient number, since it is larger than the sum of its proper divisors (1).

8889663947 is an equidigital number, since it uses as much as digits as its factorization.

8889663947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125411328, while the sum is 68.

The square root of 8889663947 is about 94285.0144349567. The cubic root of 8889663947 is about 2071.5485426967.

The spelling of 8889663947 in words is "eight billion, eight hundred eighty-nine million, six hundred sixty-three thousand, nine hundred forty-seven".