16663406651501 has 16 divisors (see below), whose sum is σ = 17109189370368. Its totient is φ = 16224537235200.

The previous prime is 16663406651473. The next prime is 16663406651537. The reversal of 16663406651501 is 10515660436661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16663406651501 is a prime.

It is a super-3 number, since 3×16663406651501³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16663406651501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16663406621501) 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 15 ways as a sum of consecutive naturals, for example, 1526645 + ... + 5971386.

It is an arithmetic number, because the mean of its divisors is an integer number (1069324335648).

Almost surely, 2^{16663406651501} is an apocalyptic number.

It is an amenable number.

16663406651501 is a deficient number, since it is larger than the sum of its proper divisors (445782718867).

16663406651501 is a wasteful number, since it uses less digits than its factorization.

16663406651501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7498492.

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 16663406651501 in words is "sixteen trillion, six hundred sixty-three billion, four hundred six million, six hundred fifty-one thousand, five hundred one".