98656865521 has 2 divisors, whose sum is σ = 98656865522. Its totient is φ = 98656865520.

The previous prime is 98656865479. The next prime is 98656865677. The reversal of 98656865521 is 12556865689.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85827905296 + 12828960225 = 292964^2 + 113265^2 .

It is a cyclic number.

It is not a de Polignac number, because 98656865521 - 2⁷ = 98656865393 is a prime.

It is a super-2 number, since 2×98656865521² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 98656865521.

It is not a weakly prime, because it can be changed into another prime (98656868521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49328432760 + 49328432761.

It is an arithmetic number, because the mean of its divisors is an integer number (49328432761).

Almost surely, 2^98656865521 is an apocalyptic number.

It is an amenable number.

98656865521 is a deficient number, since it is larger than the sum of its proper divisors (1).

98656865521 is an equidigital number, since it uses as much as digits as its factorization.

98656865521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104000, while the sum is 61.

The spelling of 98656865521 in words is "ninety-eight billion, six hundred fifty-six million, eight hundred sixty-five thousand, five hundred twenty-one".