998966651 has 2 divisors, whose sum is σ = 998966652. Its totient is φ = 998966650.

The previous prime is 998966609. The next prime is 998966653. The reversal of 998966651 is 156669899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998966651 - 2⁶ = 998966587 is a prime.

Together with 998966653, 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 (998966653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499483325 + 499483326.

It is an arithmetic number, because the mean of its divisors is an integer number (499483326).

Almost surely, 2^998966651 is an apocalyptic number.

998966651 is a deficient number, since it is larger than the sum of its proper divisors (1).

998966651 is an equidigital number, since it uses as much as digits as its factorization.

998966651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6298560, while the sum is 59.

The square root of 998966651 is about 31606.4336963220. The cubic root of 998966651 is about 999.6554316196.

The spelling of 998966651 in words is "nine hundred ninety-eight million, nine hundred sixty-six thousand, six hundred fifty-one".