7474505561 has 2 divisors, whose sum is σ = 7474505562. Its totient is φ = 7474505560.

The previous prime is 7474505537. The next prime is 7474505581. The reversal of 7474505561 is 1655054747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6435087961 + 1039417600 = 80219^2 + 32240^2 .

It is an emirp because it is prime and its reverse (1655054747) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7474505561 is a prime.

It is not a weakly prime, because it can be changed into another prime (7474505581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3737252780 + 3737252781.

It is an arithmetic number, because the mean of its divisors is an integer number (3737252781).

Almost surely, 2^7474505561 is an apocalyptic number.

It is an amenable number.

7474505561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7474505561 is an equidigital number, since it uses as much as digits as its factorization.

7474505561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588000, while the sum is 44.

The square root of 7474505561 is about 86455.2228671004. Note that the first 3 decimals coincide. The cubic root of 7474505561 is about 1955.2133615031.

The spelling of 7474505561 in words is "seven billion, four hundred seventy-four million, five hundred five thousand, five hundred sixty-one".