7715480881 has 2 divisors, whose sum is σ = 7715480882. Its totient is φ = 7715480880.

The previous prime is 7715480863. The next prime is 7715480891. The reversal of 7715480881 is 1880845177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4077461025 + 3638019856 = 63855^2 + 60316^2 .

It is an emirp because it is prime and its reverse (1880845177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7715480881 - 2⁹ = 7715480369 is a prime.

It is a super-2 number, since 2×7715480881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7715480831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3857740440 + 3857740441.

It is an arithmetic number, because the mean of its divisors is an integer number (3857740441).

Almost surely, 2^7715480881 is an apocalyptic number.

It is an amenable number.

7715480881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7715480881 is an equidigital number, since it uses as much as digits as its factorization.

7715480881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 501760, while the sum is 49.

The square root of 7715480881 is about 87837.8100876838. The cubic root of 7715480881 is about 1976.0033042372.

The spelling of 7715480881 in words is "seven billion, seven hundred fifteen million, four hundred eighty thousand, eight hundred eighty-one".