18887808950501 has 2 divisors, whose sum is σ = 18887808950502. Its totient is φ = 18887808950500.

The previous prime is 18887808950489. The next prime is 18887808950531. The reversal of 18887808950501 is 10505980878881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18201537538276 + 686271412225 = 4266326^2 + 828415^2 .

It is a cyclic number.

It is not a de Polignac number, because 18887808950501 - 2¹⁴ = 18887808934117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18887808950531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9443904475250 + 9443904475251.

It is an arithmetic number, because the mean of its divisors is an integer number (9443904475251).

Almost surely, 2^{18887808950501} is an apocalyptic number.

It is an amenable number.

18887808950501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18887808950501 is an equidigital number, since it uses as much as digits as its factorization.

18887808950501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51609600, while the sum is 68.

The spelling of 18887808950501 in words is "eighteen trillion, eight hundred eighty-seven billion, eight hundred eight million, nine hundred fifty thousand, five hundred one".