3553906561 has 4 divisors (see below), whose sum is σ = 3598892800. Its totient is φ = 3508920324.

The previous prime is 3553906519. The next prime is 3553906567. The reversal of 3553906561 is 1656093553.

3553906561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1656093553 = 8819 ⋅187787.

It is a cyclic number.

It is not a de Polignac number, because 3553906561 - 2¹¹ = 3553904513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3553906567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22493001 + ... + 22493158.

It is an arithmetic number, because the mean of its divisors is an integer number (899723200).

Almost surely, 2^3553906561 is an apocalyptic number.

It is an amenable number.

3553906561 is a deficient number, since it is larger than the sum of its proper divisors (44986239).

3553906561 is an equidigital number, since it uses as much as digits as its factorization.

3553906561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44986238.

The product of its (nonzero) digits is 364500, while the sum is 43.

The square root of 3553906561 is about 59614.6505567214. The cubic root of 3553906561 is about 1526.0496668074.

The spelling of 3553906561 in words is "three billion, five hundred fifty-three million, nine hundred six thousand, five hundred sixty-one".