20185202988761 has 2 divisors, whose sum is σ = 20185202988762. Its totient is φ = 20185202988760.

The previous prime is 20185202988737. The next prime is 20185202988791. The reversal of 20185202988761 is 16788920258102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19101794713600 + 1083408275161 = 4370560^2 + 1040869^2 .

It is a cyclic number.

It is not a de Polignac number, because 20185202988761 - 2²⁶ = 20185135879897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20185202988761.

It is not a weakly prime, because it can be changed into another prime (20185202988721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10092601494380 + 10092601494381.

It is an arithmetic number, because the mean of its divisors is an integer number (10092601494381).

Almost surely, 2^{20185202988761} is an apocalyptic number.

It is an amenable number.

20185202988761 is a deficient number, since it is larger than the sum of its proper divisors (1).

20185202988761 is an equidigital number, since it uses as much as digits as its factorization.

20185202988761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 59.

The spelling of 20185202988761 in words is "twenty trillion, one hundred eighty-five billion, two hundred two million, nine hundred eighty-eight thousand, seven hundred sixty-one".