7111777681 has 2 divisors, whose sum is σ = 7111777682. Its totient is φ = 7111777680.

The previous prime is 7111777667. The next prime is 7111777753. The reversal of 7111777681 is 1867771117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6763582081 + 348195600 = 82241^2 + 18660^2 .

It is a cyclic number.

It is not a de Polignac number, because 7111777681 - 2⁷ = 7111777553 is a prime.

It is a super-2 number, since 2×7111777681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7111777661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3555888840 + 3555888841.

It is an arithmetic number, because the mean of its divisors is an integer number (3555888841).

Almost surely, 2^7111777681 is an apocalyptic number.

It is an amenable number.

7111777681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7111777681 is an equidigital number, since it uses as much as digits as its factorization.

7111777681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115248, while the sum is 46.

The square root of 7111777681 is about 84331.3564517967. The cubic root of 7111777681 is about 1923.0595102077.

The spelling of 7111777681 in words is "seven billion, one hundred eleven million, seven hundred seventy-seven thousand, six hundred eighty-one".