988888887777761 has 2 divisors, whose sum is σ = 988888887777762. Its totient is φ = 988888887777760.

The previous prime is 988888887777671. The next prime is 988888887777793. The reversal of 988888887777761 is 167777788888889.

Together with previous prime (988888887777671) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 952470450894400 + 36418436883361 = 30862120^2 + 6034769^2 .

It is an emirp because it is prime and its reverse (167777788888889) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988888887777761 is a prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (988888887770761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494444443888880 + 494444443888881.

It is an arithmetic number, because the mean of its divisors is an integer number (494444443888881).

Almost surely, 2^{988888887777761} is an apocalyptic number.

It is an amenable number.

988888887777761 is a deficient number, since it is larger than the sum of its proper divisors (1).

988888887777761 is an equidigital number, since it uses as much as digits as its factorization.

988888887777761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1903329017856, while the sum is 107.

The spelling of 988888887777761 in words is "nine hundred eighty-eight trillion, eight hundred eighty-eight billion, eight hundred eighty-seven million, seven hundred seventy-seven thousand, seven hundred sixty-one".