20645755754599 has 2 divisors, whose sum is σ = 20645755754600. Its totient is φ = 20645755754598.

The previous prime is 20645755754567. The next prime is 20645755754609. The reversal of 20645755754599 is 99545755754602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20645755754599 - 2⁵ = 20645755754567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20645755754539) 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, 10322877877299 + 10322877877300.

It is an arithmetic number, because the mean of its divisors is an integer number (10322877877300).

Almost surely, 2^{20645755754599} is an apocalyptic number.

20645755754599 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645755754599 is an equidigital number, since it uses as much as digits as its factorization.

20645755754599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2381400000, while the sum is 73.

The spelling of 20645755754599 in words is "twenty trillion, six hundred forty-five billion, seven hundred fifty-five million, seven hundred fifty-four thousand, five hundred ninety-nine".