9896820977 has 2 divisors, whose sum is σ = 9896820978. Its totient is φ = 9896820976.

The previous prime is 9896820971. The next prime is 9896820979. The reversal of 9896820977 is 7790286989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6495715216 + 3401105761 = 80596^2 + 58319^2 .

It is a cyclic number.

It is not a de Polignac number, because 9896820977 - 2⁸ = 9896820721 is a prime.

Together with 9896820979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9896820971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4948410488 + 4948410489.

It is an arithmetic number, because the mean of its divisors is an integer number (4948410489).

Almost surely, 2^9896820977 is an apocalyptic number.

It is an amenable number.

9896820977 is a deficient number, since it is larger than the sum of its proper divisors (1).

9896820977 is an equidigital number, since it uses as much as digits as its factorization.

9896820977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 65.

The square root of 9896820977 is about 99482.7672363410. The cubic root of 9896820977 is about 2146.9993097026. Note that the first 3 decimals are identical.

The spelling of 9896820977 in words is "nine billion, eight hundred ninety-six million, eight hundred twenty thousand, nine hundred seventy-seven".