18875747237761 has 2 divisors, whose sum is σ = 18875747237762. Its totient is φ = 18875747237760.

The previous prime is 18875747237609. The next prime is 18875747237791. The reversal of 18875747237761 is 16773274757881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12798935553600 + 6076811684161 = 3577560^2 + 2465119^2 .

It is a cyclic number.

It is not a de Polignac number, because 18875747237761 - 2⁴¹ = 16676723982209 is a prime.

It is not a weakly prime, because it can be changed into another prime (18875747237791) 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, 9437873618880 + 9437873618881.

It is an arithmetic number, because the mean of its divisors is an integer number (9437873618881).

Almost surely, 2^{18875747237761} is an apocalyptic number.

It is an amenable number.

18875747237761 is a deficient number, since it is larger than the sum of its proper divisors (1).

18875747237761 is an equidigital number, since it uses as much as digits as its factorization.

18875747237761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774466560, while the sum is 73.

The spelling of 18875747237761 in words is "eighteen trillion, eight hundred seventy-five billion, seven hundred forty-seven million, two hundred thirty-seven thousand, seven hundred sixty-one".