16662063645 has 24 divisors (see below), whose sum is σ = 28884258936. Its totient is φ = 8885403648.

The previous prime is 16662063643. The next prime is 16662063653. The reversal of 16662063645 is 54636026661.

16662063645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10950785316 + 5711278329 = 104646^2 + 75573^2 .

It is not a de Polignac number, because 16662063645 - 2¹ = 16662063643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16662063645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16662063643) 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 23 ways as a sum of consecutive naturals, for example, 522397 + ... + 553373.

It is an arithmetic number, because the mean of its divisors is an integer number (1203510789).

Almost surely, 2^16662063645 is an apocalyptic number.

16662063645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16662063645 is a deficient number, since it is larger than the sum of its proper divisors (12222195291).

16662063645 is a wasteful number, since it uses less digits than its factorization.

16662063645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42941 (or 42938 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 16662063645 in words is "sixteen billion, six hundred sixty-two million, sixty-three thousand, six hundred forty-five".