3665506405 has 16 divisors (see below), whose sum is σ = 4910076864. Its totient is φ = 2603825280.

The previous prime is 3665506399. The next prime is 3665506451. The reversal of 3665506405 is 5046055663.

It is a happy number.

It is not a de Polignac number, because 3665506405 - 2²⁹ = 3128635493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 772584 + ... + 777313.

It is an arithmetic number, because the mean of its divisors is an integer number (306879804).

Almost surely, 2^3665506405 is an apocalyptic number.

It is an amenable number.

3665506405 is a deficient number, since it is larger than the sum of its proper divisors (1244570459).

3665506405 is a wasteful number, since it uses less digits than its factorization.

3665506405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549956.

The product of its (nonzero) digits is 324000, while the sum is 40.

The square root of 3665506405 is about 60543.4257785269. The cubic root of 3665506405 is about 1541.8590026928.

The spelling of 3665506405 in words is "three billion, six hundred sixty-five million, five hundred six thousand, four hundred five".