9778451858 has 30 divisors (see below), whose sum is σ = 17123272071. Its totient is φ = 4187828316.

The previous prime is 9778451843. The next prime is 9778451869. The reversal of 9778451858 is 8581548779.

9778451858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 4889225929 + 4889225929 = 69923^2 + 69923^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=69923.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9778451858.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6851741 + ... + 6853167.

Almost surely, 2^9778451858 is an apocalyptic number.

9778451858 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

9778451858 is a deficient number, since it is larger than the sum of its proper divisors (7344820213).

9778451858 is an frugal number, since it uses more digits than its factorization.

9778451858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884 (or 1436 counting only the distinct ones).

The product of its digits is 22579200, while the sum is 62.

The square root of 9778451858 is about 98886.0549218139. The cubic root of 9778451858 is about 2138.4053583102.

The spelling of 9778451858 in words is "nine billion, seven hundred seventy-eight million, four hundred fifty-one thousand, eight hundred fifty-eight".