16653621629 has 2 divisors, whose sum is σ = 16653621630. Its totient is φ = 16653621628.

The previous prime is 16653621587. The next prime is 16653621701. The reversal of 16653621629 is 92612635661.

16653621629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12039136729 + 4614484900 = 109723^2 + 67930^2 .

It is a cyclic number.

It is not a de Polignac number, because 16653621629 - 2¹⁶ = 16653556093 is a prime.

It is a super-2 number, since 2×16653621629² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16653621029) 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 as a sum of consecutive naturals, namely, 8326810814 + 8326810815.

It is an arithmetic number, because the mean of its divisors is an integer number (8326810815).

Almost surely, 2^16653621629 is an apocalyptic number.

It is an amenable number.

16653621629 is a deficient number, since it is larger than the sum of its proper divisors (1).

16653621629 is an equidigital number, since it uses as much as digits as its factorization.

16653621629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 47.

The spelling of 16653621629 in words is "sixteen billion, six hundred fifty-three million, six hundred twenty-one thousand, six hundred twenty-nine".