7667287681 has 2 divisors, whose sum is σ = 7667287682. Its totient is φ = 7667287680.

The previous prime is 7667287669. The next prime is 7667287687. The reversal of 7667287681 is 1867827667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7663251600 + 4036081 = 87540^2 + 2009^2 .

It is an emirp because it is prime and its reverse (1867827667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7667287681 - 2⁹ = 7667287169 is a prime.

It is a super-2 number, since 2×7667287681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7667287687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3833643840 + 3833643841.

It is an arithmetic number, because the mean of its divisors is an integer number (3833643841).

Almost surely, 2^7667287681 is an apocalyptic number.

It is an amenable number.

7667287681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7667287681 is an equidigital number, since it uses as much as digits as its factorization.

7667287681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9483264, while the sum is 58.

The square root of 7667287681 is about 87563.0497470251. The cubic root of 7667287681 is about 1971.8804723602.

The spelling of 7667287681 in words is "seven billion, six hundred sixty-seven million, two hundred eighty-seven thousand, six hundred eighty-one".