7479779809 has 2 divisors, whose sum is σ = 7479779810. Its totient is φ = 7479779808.

The previous prime is 7479779737. The next prime is 7479779819. The reversal of 7479779809 is 9089779747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4921443409 + 2558336400 = 70153^2 + 50580^2 .

It is an emirp because it is prime and its reverse (9089779747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7479779809 - 2⁹ = 7479779297 is a prime.

It is a super-2 number, since 2×7479779809² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7479779819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3739889904 + 3739889905.

It is an arithmetic number, because the mean of its divisors is an integer number (3739889905).

Almost surely, 2^7479779809 is an apocalyptic number.

It is an amenable number.

7479779809 is a deficient number, since it is larger than the sum of its proper divisors (1).

7479779809 is an equidigital number, since it uses as much as digits as its factorization.

7479779809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56010528, while the sum is 67.

The square root of 7479779809 is about 86485.7202606303. The cubic root of 7479779809 is about 1955.6731402123.

The spelling of 7479779809 in words is "seven billion, four hundred seventy-nine million, seven hundred seventy-nine thousand, eight hundred nine".