3663605405 has 8 divisors (see below), whose sum is σ = 4468397784. Its totient is φ = 2882836800.

The previous prime is 3663605401. The next prime is 3663605423. The reversal of 3663605405 is 5045063663.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 336392281 + 3327213124 = 18341^2 + 57682^2 .

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

It is not a de Polignac number, because 3663605405 - 2² = 3663605401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3663605401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6005606 + ... + 6006215.

It is an arithmetic number, because the mean of its divisors is an integer number (558549723).

Almost surely, 2^3663605405 is an apocalyptic number.

It is an amenable number.

3663605405 is a deficient number, since it is larger than the sum of its proper divisors (804792379).

3663605405 is a wasteful number, since it uses less digits than its factorization.

3663605405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011887.

The product of its (nonzero) digits is 194400, while the sum is 38.

The square root of 3663605405 is about 60527.7242674793. The cubic root of 3663605405 is about 1541.5924109872.

The spelling of 3663605405 in words is "three billion, six hundred sixty-three million, six hundred five thousand, four hundred five".