20644660151 has 2 divisors, whose sum is σ = 20644660152. Its totient is φ = 20644660150.

The previous prime is 20644660129. The next prime is 20644660213. The reversal of 20644660151 is 15106644602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20644660151 - 2¹⁰ = 20644659127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20644660951) 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, 10322330075 + 10322330076.

It is an arithmetic number, because the mean of its divisors is an integer number (10322330076).

Almost surely, 2^20644660151 is an apocalyptic number.

20644660151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20644660151 is an equidigital number, since it uses as much as digits as its factorization.

20644660151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 20644660151 in words is "twenty billion, six hundred forty-four million, six hundred sixty thousand, one hundred fifty-one".