16516363657945 has 16 divisors (see below), whose sum is σ = 19921694953680. Its totient is φ = 13145192032000.

The previous prime is 16516363657933. The next prime is 16516363657967. The reversal of 16516363657945 is 54975636361561.

It can be written as a sum of positive squares in 8 ways, for example, as 2287934558464 + 14228429099481 = 1512592^2 + 3772059^2 .

It is not a de Polignac number, because 16516363657945 - 2²⁵ = 16516330103513 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7815946 + ... + 9701635.

It is an arithmetic number, because the mean of its divisors is an integer number (1245105934605).

Almost surely, 2^{16516363657945} is an apocalyptic number.

It is an amenable number.

16516363657945 is a deficient number, since it is larger than the sum of its proper divisors (3405331295735).

16516363657945 is a wasteful number, since it uses less digits than its factorization.

16516363657945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17518556.

The product of its digits is 367416000, while the sum is 67.

The spelling of 16516363657945 in words is "sixteen trillion, five hundred sixteen billion, three hundred sixty-three million, six hundred fifty-seven thousand, nine hundred forty-five".