98987654561 has 2 divisors, whose sum is σ = 98987654562. Its totient is φ = 98987654560.

The previous prime is 98987654537. The next prime is 98987654567. The reversal of 98987654561 is 16545678989.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55398566161 + 43589088400 = 235369^2 + 208780^2 .

It is a cyclic number.

It is not a de Polignac number, because 98987654561 - 2⁶ = 98987654497 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 98987654491 and 98987654500.

It is not a weakly prime, because it can be changed into another prime (98987654567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49493827280 + 49493827281.

It is an arithmetic number, because the mean of its divisors is an integer number (49493827281).

Almost surely, 2^98987654561 is an apocalyptic number.

It is an amenable number.

98987654561 is a deficient number, since it is larger than the sum of its proper divisors (1).

98987654561 is an equidigital number, since it uses as much as digits as its factorization.

98987654561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 130636800, while the sum is 68.

The spelling of 98987654561 in words is "ninety-eight billion, nine hundred eighty-seven million, six hundred fifty-four thousand, five hundred sixty-one".