16521980953 has 8 divisors (see below), whose sum is σ = 16569809408. Its totient is φ = 16474221504.

The previous prime is 16521980911. The next prime is 16521980957. The reversal of 16521980953 is 35908912561.

16521980953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16521980953 - 2²¹ = 16519883801 is a prime.

It is a super-2 number, since 2×16521980953² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16521980897 and 16521980906.

It is not an unprimeable number, because it can be changed into a prime (16521980957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483025 + ... + 516097.

It is an arithmetic number, because the mean of its divisors is an integer number (2071226176).

Almost surely, 2^16521980953 is an apocalyptic number.

It is an amenable number.

16521980953 is a deficient number, since it is larger than the sum of its proper divisors (47828455).

16521980953 is an equidigital number, since it uses as much as digits as its factorization.

16521980953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34503.

The product of its (nonzero) digits is 583200, while the sum is 49.

The spelling of 16521980953 in words is "sixteen billion, five hundred twenty-one million, nine hundred eighty thousand, nine hundred fifty-three".