9778884671 has 2 divisors, whose sum is σ = 9778884672. Its totient is φ = 9778884670.

The previous prime is 9778884617. The next prime is 9778884707. The reversal of 9778884671 is 1764888779.

Together with previous prime (9778884617) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9778884671 - 2⁶ = 9778884607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9778884598 and 9778884607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9778884611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4889442335 + 4889442336.

It is an arithmetic number, because the mean of its divisors is an integer number (4889442336).

Almost surely, 2^9778884671 is an apocalyptic number.

9778884671 is a deficient number, since it is larger than the sum of its proper divisors (1).

9778884671 is an equidigital number, since it uses as much as digits as its factorization.

9778884671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37933056, while the sum is 65.

The square root of 9778884671 is about 98888.2433406520. The cubic root of 9778884671 is about 2138.4369078164.

The spelling of 9778884671 in words is "nine billion, seven hundred seventy-eight million, eight hundred eighty-four thousand, six hundred seventy-one".