98877655543221 has 24 divisors (see below), whose sum is σ = 151256683093464. Its totient is φ = 62027739985920.

The previous prime is 98877655543141. The next prime is 98877655543229. The reversal of 98877655543221 is 12234555677889.

98877655543221 is a `hidden beast` number, since 9 + 8 + 8 + 7 + 7 + 6 + 55 + 543 + 2 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 64507225026321 + 34370430516900 = 8031639^2 + 5862630^2 .

It is not a de Polignac number, because 98877655543221 - 2³³ = 98869065608629 is a prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 98877655543221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98877655543229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67722846 + ... + 69167471.

It is an arithmetic number, because the mean of its divisors is an integer number (6302361795561).

Almost surely, 2^{98877655543221} is an apocalyptic number.

It is an amenable number.

98877655543221 is a deficient number, since it is larger than the sum of its proper divisors (52379027550243).

98877655543221 is a wasteful number, since it uses less digits than its factorization.

98877655543221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136895061 (or 136895058 counting only the distinct ones).

The product of its digits is 1016064000, while the sum is 72.

The spelling of 98877655543221 in words is "ninety-eight trillion, eight hundred seventy-seven billion, six hundred fifty-five million, five hundred forty-three thousand, two hundred twenty-one".