16646522564661 has 32 divisors (see below), whose sum is σ = 25076582608896. Its totient is φ = 9735073656000.

The previous prime is 16646522564653. The next prime is 16646522564701.

16646522564661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16646522564661 - 2³ = 16646522564653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16646522564595 and 16646522564604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16646522564561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75472750 + ... + 75692991.

It is an arithmetic number, because the mean of its divisors is an integer number (783643206528).

Almost surely, 2^{16646522564661} is an apocalyptic number.

16646522564661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16646522564661 is a deficient number, since it is larger than the sum of its proper divisors (8430060044235).

16646522564661 is a wasteful number, since it uses less digits than its factorization.

16646522564661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151165873.

The product of its digits is 74649600, while the sum is 60.

The spelling of 16646522564661 in words is "sixteen trillion, six hundred forty-six billion, five hundred twenty-two million, five hundred sixty-four thousand, six hundred sixty-one".