3561552775481 has 2 divisors, whose sum is σ = 3561552775482. Its totient is φ = 3561552775480.

The previous prime is 3561552775447. The next prime is 3561552775511. The reversal of 3561552775481 is 1845772551653.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3324368191225 + 237184584256 = 1823285^2 + 487016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3561552775481 is a prime.

It is a super-2 number, since 2×3561552775481² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3561552775481.

It is not a weakly prime, because it can be changed into another prime (3561552775411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1780776387740 + 1780776387741.

It is an arithmetic number, because the mean of its divisors is an integer number (1780776387741).

Almost surely, 2^{3561552775481} is an apocalyptic number.

It is an amenable number.

3561552775481 is a deficient number, since it is larger than the sum of its proper divisors (1).

3561552775481 is an equidigital number, since it uses as much as digits as its factorization.

3561552775481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280000, while the sum is 59.

The spelling of 3561552775481 in words is "three trillion, five hundred sixty-one billion, five hundred fifty-two million, seven hundred seventy-five thousand, four hundred eighty-one".