98778281471991 has 32 divisors (see below), whose sum is σ = 159649505072640. Its totient is φ = 59862685867200.

The previous prime is 98778281471971. The next prime is 98778281472041. The reversal of 98778281471991 is 19917418287789.

98778281471991 is a `hidden beast` number, since 9 + 87 + 78 + 281 + 4 + 7 + 199 + 1 = 666.

It is not a de Polignac number, because 98778281471991 - 2¹¹ = 98778281469943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 98778281471991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98778281471971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2097715 + ... + 14211156.

It is an arithmetic number, because the mean of its divisors is an integer number (4989047033520).

Almost surely, 2^{98778281471991} is an apocalyptic number.

98778281471991 is a deficient number, since it is larger than the sum of its proper divisors (60871223600649).

98778281471991 is a wasteful number, since it uses less digits than its factorization.

98778281471991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16329284 (or 16329278 counting only the distinct ones).

The product of its digits is 1024192512, while the sum is 81.

The spelling of 98778281471991 in words is "ninety-eight trillion, seven hundred seventy-eight billion, two hundred eighty-one million, four hundred seventy-one thousand, nine hundred ninety-one".