7481777813 has 2 divisors, whose sum is σ = 7481777814. Its totient is φ = 7481777812.

The previous prime is 7481777729. The next prime is 7481777869. The reversal of 7481777813 is 3187771847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6545295409 + 936482404 = 80903^2 + 30602^2 .

It is a cyclic number.

It is not a de Polignac number, because 7481777813 - 2⁸ = 7481777557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7481777213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3740888906 + 3740888907.

It is an arithmetic number, because the mean of its divisors is an integer number (3740888907).

Almost surely, 2^7481777813 is an apocalyptic number.

It is an amenable number.

7481777813 is a deficient number, since it is larger than the sum of its proper divisors (1).

7481777813 is an equidigital number, since it uses as much as digits as its factorization.

7481777813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1843968, while the sum is 53.

The square root of 7481777813 is about 86497.2705523128. The cubic root of 7481777813 is about 1955.8472583008.

The spelling of 7481777813 in words is "seven billion, four hundred eighty-one million, seven hundred seventy-seven thousand, eight hundred thirteen".