7816386481 has 2 divisors, whose sum is σ = 7816386482. Its totient is φ = 7816386480.

The previous prime is 7816386397. The next prime is 7816386503. The reversal of 7816386481 is 1846836187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6179374881 + 1637011600 = 78609^2 + 40460^2 .

It is a cyclic number.

It is not a de Polignac number, because 7816386481 - 2⁷ = 7816386353 is a prime.

It is a super-2 number, since 2×7816386481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7816386581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3908193240 + 3908193241.

It is an arithmetic number, because the mean of its divisors is an integer number (3908193241).

Almost surely, 2^7816386481 is an apocalyptic number.

It is an amenable number.

7816386481 is a deficient number, since it is larger than the sum of its proper divisors (1).

7816386481 is an equidigital number, since it uses as much as digits as its factorization.

7816386481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 52.

The square root of 7816386481 is about 88410.3301713097. The cubic root of 7816386481 is about 1984.5802952952.

The spelling of 7816386481 in words is "seven billion, eight hundred sixteen million, three hundred eighty-six thousand, four hundred eighty-one".