20183764068649 has 2 divisors, whose sum is σ = 20183764068650. Its totient is φ = 20183764068648.

The previous prime is 20183764068547. The next prime is 20183764068691. The reversal of 20183764068649 is 94686046738102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19736410434624 + 447353634025 = 4442568^2 + 668845^2 .

It is a cyclic number.

It is not a de Polignac number, because 20183764068649 - 2¹⁵ = 20183764035881 is a prime.

It is not a weakly prime, because it can be changed into another prime (20183764068449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10091882034324 + 10091882034325.

It is an arithmetic number, because the mean of its divisors is an integer number (10091882034325).

Almost surely, 2^{20183764068649} is an apocalyptic number.

It is an amenable number.

20183764068649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20183764068649 is an equidigital number, since it uses as much as digits as its factorization.

20183764068649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83607552, while the sum is 64.

The spelling of 20183764068649 in words is "twenty trillion, one hundred eighty-three billion, seven hundred sixty-four million, sixty-eight thousand, six hundred forty-nine".