3561813655 has 8 divisors (see below), whose sum is σ = 4274751312. Its totient is φ = 2849067648.

The previous prime is 3561813653. The next prime is 3561813677. The reversal of 3561813655 is 5563181653.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3561813655 - 2¹ = 3561813653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561813653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3234 + ... + 84463.

It is an arithmetic number, because the mean of its divisors is an integer number (534343914).

Almost surely, 2^3561813655 is an apocalyptic number.

3561813655 is a deficient number, since it is larger than the sum of its proper divisors (712937657).

3561813655 is an equidigital number, since it uses as much as digits as its factorization.

3561813655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95825.

The product of its digits is 324000, while the sum is 43.

The square root of 3561813655 is about 59680.9320889009. The cubic root of 3561813655 is about 1527.1805988290.

It can be divided in two parts, 3561 and 813655, that added together give a square (817216 = 904²).

The spelling of 3561813655 in words is "three billion, five hundred sixty-one million, eight hundred thirteen thousand, six hundred fifty-five".