8127467681 has 2 divisors, whose sum is σ = 8127467682. Its totient is φ = 8127467680.

The previous prime is 8127467641. The next prime is 8127467713. The reversal of 8127467681 is 1867647218.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6112894225 + 2014573456 = 78185^2 + 44884^2 .

It is a cyclic number.

It is not a de Polignac number, because 8127467681 - 2⁶ = 8127467617 is a prime.

It is a super-2 number, since 2×8127467681² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8127467641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4063733840 + 4063733841.

It is an arithmetic number, because the mean of its divisors is an integer number (4063733841).

Almost surely, 2^8127467681 is an apocalyptic number.

It is an amenable number.

8127467681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8127467681 is an equidigital number, since it uses as much as digits as its factorization.

8127467681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 50.

The square root of 8127467681 is about 90152.4690787779. The cubic root of 8127467681 is about 2010.5663842024.

The spelling of 8127467681 in words is "eight billion, one hundred twenty-seven million, four hundred sixty-seven thousand, six hundred eighty-one".