16506416970481 has 3 divisors (see below), whose sum is σ = 16506421033291. Its totient is φ = 16506412907672.

The previous prime is 16506416970437. The next prime is 16506416970509. The reversal of 16506416970481 is 18407961460561.

It is a happy number.

The square root of 16506416970481 is 4062809.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 12002005000881 + 4504411969600 = 3464391^2 + 2122360^2 .

It is not a de Polignac number, because 16506416970481 - 2⁷ = 16506416970353 is a prime.

It is a super-2 number, since 2×16506416970481² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16506416976481) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2031405 + ... + 6094213.

Almost surely, 2^{16506416970481} is an apocalyptic number.

16506416970481 is the 4062809-th square number.

16506416970481 is the 2031405-th centered octagonal number.

It is an amenable number.

16506416970481 is a deficient number, since it is larger than the sum of its proper divisors (4062810).

16506416970481 is an frugal number, since it uses more digits than its factorization.

16506416970481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8125618 (or 4062809 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 16506416970481 in words is "sixteen trillion, five hundred six billion, four hundred sixteen million, nine hundred seventy thousand, four hundred eighty-one".