87126968857 has 2 divisors, whose sum is σ = 87126968858. Its totient is φ = 87126968856.

The previous prime is 87126968849. The next prime is 87126968881. The reversal of 87126968857 is 75886962178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86971318281 + 155650576 = 294909^2 + 12476^2 .

It is a cyclic number.

It is not a de Polignac number, because 87126968857 - 2³ = 87126968849 is a prime.

It is a super-2 number, since 2×87126968857² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87126968792 and 87126968801.

It is not a weakly prime, because it can be changed into another prime (87126968837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43563484428 + 43563484429.

It is an arithmetic number, because the mean of its divisors is an integer number (43563484429).

Almost surely, 2^87126968857 is an apocalyptic number.

It is an amenable number.

87126968857 is a deficient number, since it is larger than the sum of its proper divisors (1).

87126968857 is an equidigital number, since it uses as much as digits as its factorization.

87126968857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81285120, while the sum is 67.

The spelling of 87126968857 in words is "eighty-seven billion, one hundred twenty-six million, nine hundred sixty-eight thousand, eight hundred fifty-seven".