20633664541549 has 2 divisors, whose sum is σ = 20633664541550. Its totient is φ = 20633664541548.

The previous prime is 20633664541471. The next prime is 20633664541613. The reversal of 20633664541549 is 94514546633602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20618410562500 + 15253979049 = 4540750^2 + 123507^2 .

It is a cyclic number.

It is not a de Polignac number, because 20633664541549 - 2¹⁷ = 20633664410477 is a prime.

It is a super-2 number, since 2×20633664541549² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20633664541493 and 20633664541502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20633664541249) 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 as a sum of consecutive naturals, namely, 10316832270774 + 10316832270775.

It is an arithmetic number, because the mean of its divisors is an integer number (10316832270775).

Almost surely, 2^{20633664541549} is an apocalyptic number.

It is an amenable number.

20633664541549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20633664541549 is an equidigital number, since it uses as much as digits as its factorization.

20633664541549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55987200, while the sum is 58.

The spelling of 20633664541549 in words is "twenty trillion, six hundred thirty-three billion, six hundred sixty-four million, five hundred forty-one thousand, five hundred forty-nine".