3538955561 has 6 divisors (see below), whose sum is σ = 3735019962. Its totient is φ = 3352694400.

The previous prime is 3538955543. The next prime is 3538955573. The reversal of 3538955561 is 1655598353.

It can be written as a sum of positive squares in only one way, i.e., 3195075625 + 343879936 = 56525^2 + 18544^2 .

It is not a de Polignac number, because 3538955561 - 2¹⁰ = 3538954537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3538955531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4901240 + ... + 4901961.

It is an arithmetic number, because the mean of its divisors is an integer number (622503327).

Almost surely, 2^3538955561 is an apocalyptic number.

It is an amenable number.

3538955561 is a deficient number, since it is larger than the sum of its proper divisors (196064401).

3538955561 is an equidigital number, since it uses as much as digits as its factorization.

3538955561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9803239 (or 9803220 counting only the distinct ones).

The product of its digits is 2430000, while the sum is 50.

The square root of 3538955561 is about 59489.1213668516. The cubic root of 3538955561 is about 1523.9066693154.

The spelling of 3538955561 in words is "three billion, five hundred thirty-eight million, nine hundred fifty-five thousand, five hundred sixty-one".