20288664438433 has 2 divisors, whose sum is σ = 20288664438434. Its totient is φ = 20288664438432.

The previous prime is 20288664438409. The next prime is 20288664438517. The reversal of 20288664438433 is 33483446688202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19583563310224 + 705101128209 = 4425332^2 + 839703^2 .

It is a cyclic number.

It is not a de Polignac number, because 20288664438433 - 2¹³ = 20288664430241 is a prime.

It is not a weakly prime, because it can be changed into another prime (20288664438233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10144332219216 + 10144332219217.

It is an arithmetic number, because the mean of its divisors is an integer number (10144332219217).

Almost surely, 2^{20288664438433} is an apocalyptic number.

It is an amenable number.

20288664438433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20288664438433 is an equidigital number, since it uses as much as digits as its factorization.

20288664438433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127401984, while the sum is 61.

The spelling of 20288664438433 in words is "twenty trillion, two hundred eighty-eight billion, six hundred sixty-four million, four hundred thirty-eight thousand, four hundred thirty-three".