9994981082257 has 8 divisors (see below), whose sum is σ = 10008587152872. Its totient is φ = 9981377683200.

The previous prime is 9994981082221. The next prime is 9994981082341. The reversal of 9994981082257 is 7522801894999.

It is a Cunningham number, because it is equal to 3161484²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 4846760759296 + 5148220322961 = 2201536^2 + 2268969^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9994981082257 - 2²³ = 9994972693649 is a prime.

It is a super-2 number, since 2×9994981082257² (a number of 27 digits) contains 22 as substring.

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 9994981082257.

It is not an unprimeable number, because it can be changed into a prime (9994981062257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6877657 + ... + 8203177.

It is an arithmetic number, because the mean of its divisors is an integer number (1251073394109).

Almost surely, 2^{9994981082257} is an apocalyptic number.

It is an amenable number.

9994981082257 is a deficient number, since it is larger than the sum of its proper divisors (13606070615).

9994981082257 is a wasteful number, since it uses less digits than its factorization.

9994981082257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335779.

The product of its (nonzero) digits is 235146240, while the sum is 73.

The spelling of 9994981082257 in words is "nine trillion, nine hundred ninety-four billion, nine hundred eighty-one million, eighty-two thousand, two hundred fifty-seven".