88117555781 has 2 divisors, whose sum is σ = 88117555782. Its totient is φ = 88117555780.

The previous prime is 88117555777. The next prime is 88117555807. The reversal of 88117555781 is 18755571188.

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., 57292730881 + 30824824900 = 239359^2 + 175570^2 .

It is a cyclic number.

It is not a de Polignac number, because 88117555781 - 2² = 88117555777 is a prime.

It is a super-3 number, since 3×88117555781³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88117555711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44058777890 + 44058777891.

It is an arithmetic number, because the mean of its divisors is an integer number (44058777891).

Almost surely, 2^88117555781 is an apocalyptic number.

It is an amenable number.

88117555781 is a deficient number, since it is larger than the sum of its proper divisors (1).

88117555781 is an equidigital number, since it uses as much as digits as its factorization.

88117555781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136000, while the sum is 56.

The spelling of 88117555781 in words is "eighty-eight billion, one hundred seventeen million, five hundred fifty-five thousand, seven hundred eighty-one".