9978655273 has 2 divisors, whose sum is σ = 9978655274. Its totient is φ = 9978655272.

The previous prime is 9978655231. The next prime is 9978655279. The reversal of 9978655273 is 3725568799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8565872704 + 1412782569 = 92552^2 + 37587^2 .

It is an emirp because it is prime and its reverse (3725568799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9978655273 - 2¹⁷ = 9978524201 is a prime.

It is a super-2 number, since 2×9978655273² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9978655279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989327636 + 4989327637.

It is an arithmetic number, because the mean of its divisors is an integer number (4989327637).

Almost surely, 2^9978655273 is an apocalyptic number.

It is an amenable number.

9978655273 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978655273 is an equidigital number, since it uses as much as digits as its factorization.

9978655273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28576800, while the sum is 61.

The square root of 9978655273 is about 99893.2193544687. The cubic root of 9978655273 is about 2152.9007374437.

The spelling of 9978655273 in words is "nine billion, nine hundred seventy-eight million, six hundred fifty-five thousand, two hundred seventy-three".