998923280851 has 2 divisors, whose sum is σ = 998923280852. Its totient is φ = 998923280850.

The previous prime is 998923280827. The next prime is 998923280863. The reversal of 998923280851 is 158082329899.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998923280851 - 2¹¹ = 998923278803 is a prime.

It is a super-2 number, since 2×998923280851² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (998923280891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499461640425 + 499461640426.

It is an arithmetic number, because the mean of its divisors is an integer number (499461640426).

Almost surely, 2^998923280851 is an apocalyptic number.

998923280851 is a deficient number, since it is larger than the sum of its proper divisors (1).

998923280851 is an equidigital number, since it uses as much as digits as its factorization.

998923280851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22394880, while the sum is 64.

The spelling of 998923280851 in words is "nine hundred ninety-eight billion, nine hundred twenty-three million, two hundred eighty thousand, eight hundred fifty-one".