16645533636361 has 12 divisors (see below), whose sum is σ = 20502181886868. Its totient is φ = 13428329655552.

The previous prime is 16645533636359. The next prime is 16645533636373. The reversal of 16645533636361 is 16363633554661.

It can be written as a sum of positive squares in 2 ways, for example, as 12469514688400 + 4176018947961 = 3531220^2 + 2043531^2 .

It is not a de Polignac number, because 16645533636361 - 2¹ = 16645533636359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16645533636296 and 16645533636305.

It is not an unprimeable number, because it can be changed into a prime (16645533636301) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 9991315876 + ... + 9991317541.

It is an arithmetic number, because the mean of its divisors is an integer number (1708515157239).

Almost surely, 2^{16645533636361} is an apocalyptic number.

It is an amenable number.

16645533636361 is a deficient number, since it is larger than the sum of its proper divisors (3856648250507).

16645533636361 is a wasteful number, since it uses less digits than its factorization.

16645533636361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19982633448 (or 19982633441 counting only the distinct ones).

The product of its digits is 62985600, while the sum is 58.

The spelling of 16645533636361 in words is "sixteen trillion, six hundred forty-five billion, five hundred thirty-three million, six hundred thirty-six thousand, three hundred sixty-one".