9781607043994 has 8 divisors (see below), whose sum is σ = 14779508453748. Its totient is φ = 4855104226080.

The previous prime is 9781607043979. The next prime is 9781607044019. The reversal of 9781607043994 is 4993407061879.

It can be written as a sum of positive squares in 2 ways, for example, as 9389965133025 + 391641910969 = 3064305^2 + 625813^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×9781607043994² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 17849647617 + ... + 17849648164.

Almost surely, 2^{9781607043994} is an apocalyptic number.

9781607043994 is a deficient number, since it is larger than the sum of its proper divisors (4997901409754).

9781607043994 is a wasteful number, since it uses less digits than its factorization.

9781607043994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35699295920.

The product of its (nonzero) digits is 82301184, while the sum is 67.

The spelling of 9781607043994 in words is "nine trillion, seven hundred eighty-one billion, six hundred seven million, forty-three thousand, nine hundred ninety-four".