988864309521 has 12 divisors (see below), whose sum is σ = 1558210427280. Its totient is φ = 599311702680.

The previous prime is 988864309519. The next prime is 988864309529. The reversal of 988864309521 is 125903468889.

988864309521 is a `hidden beast` number, since 98 + 8 + 8 + 6 + 430 + 95 + 21 = 666.

It is not a de Polignac number, because 988864309521 - 2¹ = 988864309519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (988864309529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4994264091 + ... + 4994264288.

It is an arithmetic number, because the mean of its divisors is an integer number (129850868940).

Almost surely, 2^988864309521 is an apocalyptic number.

It is an amenable number.

988864309521 is a deficient number, since it is larger than the sum of its proper divisors (569346117759).

988864309521 is a wasteful number, since it uses less digits than its factorization.

988864309521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9988528396 (or 9988528393 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 63.

The spelling of 988864309521 in words is "nine hundred eighty-eight billion, eight hundred sixty-four million, three hundred nine thousand, five hundred twenty-one".