5661557441 has 2 divisors, whose sum is σ = 5661557442. Its totient is φ = 5661557440.

The previous prime is 5661557417. The next prime is 5661557453. The reversal of 5661557441 is 1447551665.

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., 4269969025 + 1391588416 = 65345^2 + 37304^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661557441 - 2²⁶ = 5594448577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5661557392 and 5661557401.

It is not a weakly prime, because it can be changed into another prime (5661557411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830778720 + 2830778721.

It is an arithmetic number, because the mean of its divisors is an integer number (2830778721).

Almost surely, 2^5661557441 is an apocalyptic number.

It is an amenable number.

5661557441 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661557441 is an equidigital number, since it uses as much as digits as its factorization.

5661557441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504000, while the sum is 44.

The square root of 5661557441 is about 75243.3215707547. The cubic root of 5661557441 is about 1782.2911036570.

The spelling of 5661557441 in words is "five billion, six hundred sixty-one million, five hundred fifty-seven thousand, four hundred forty-one".