9980554521 has 16 divisors (see below), whose sum is σ = 15231775104. Its totient is φ = 5694432384.

The previous prime is 9980554513. The next prime is 9980554523. The reversal of 9980554521 is 1254550899.

It is not a de Polignac number, because 9980554521 - 2³ = 9980554513 is a prime.

It is a super-2 number, since 2×9980554521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9980554523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350196 + ... + 377621.

It is an arithmetic number, because the mean of its divisors is an integer number (951985944).

Almost surely, 2^9980554521 is an apocalyptic number.

It is an amenable number.

9980554521 is a deficient number, since it is larger than the sum of its proper divisors (5251220583).

9980554521 is a wasteful number, since it uses less digits than its factorization.

9980554521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728480.

The product of its (nonzero) digits is 648000, while the sum is 48.

The square root of 9980554521 is about 99902.7252931570. The cubic root of 9980554521 is about 2153.0373167363.

The spelling of 9980554521 in words is "nine billion, nine hundred eighty million, five hundred fifty-four thousand, five hundred twenty-one".