944778168009 has 27 divisors (see below), whose sum is σ = 1477789249287. Its totient is φ = 581378621616.

The previous prime is 944778167953. The next prime is 944778168011. The reversal of 944778168009 is 900861877449.

The square root of 944778168009 is 971997.

It is a perfect power (a square), and thus also a powerful number.

944778168009 is a `hidden beast` number, since 9 + 4 + 477 + 81 + 6 + 80 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 139760084025 + 805018083984 = 373845^2 + 897228^2 .

It is a de Polignac number, because none of the positive numbers 2^k-944778168009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (944778168209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 37895422 + ... + 37920344.

Almost surely, 2^944778168009 is an apocalyptic number.

944778168009 is the 971997-th square number.

944778168009 is the 485999-th centered octagonal number.

It is an amenable number.

944778168009 is a deficient number, since it is larger than the sum of its proper divisors (533011081278).

944778168009 is an frugal number, since it uses more digits than its factorization.

944778168009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49878 (or 24939 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 944778168009 in words is "nine hundred forty-four billion, seven hundred seventy-eight million, one hundred sixty-eight thousand, nine".